diff --git a/arch/arm/src/cxd56xx/cxd56_emmc.c b/arch/arm/src/cxd56xx/cxd56_emmc.c
index d9ec83393c894..b7843a603fc9d 100644
--- a/arch/arm/src/cxd56xx/cxd56_emmc.c
+++ b/arch/arm/src/cxd56xx/cxd56_emmc.c
@@ -103,12 +103,13 @@ struct cxd56_emmc_state_s
 static int       cxd56_emmc_open(FAR struct inode *inode);
 static int       cxd56_emmc_close(FAR struct inode *inode);
 static ssize_t   cxd56_emmc_read(FAR struct inode *inode,
-                                 unsigned char *buffer, size_t start_sector,
+                                 unsigned char *buffer,
+                                 blkcnt_t start_sector,
                                  unsigned int nsectors);
 #if !defined(CONFIG_MMCSD_READONLY)
 static ssize_t   cxd56_emmc_write(FAR struct inode *inode,
                                   const unsigned char *buffer,
-                                  size_t start_sector,
+                                  blkcnt_t start_sector,
                                   unsigned int nsectors);
 #endif
 static int       cxd56_emmc_geometry(FAR struct inode *inode,
@@ -348,7 +349,7 @@ static int emmc_checkresponse(void)
 
   if (resp & R1STATUS_ALL_ERR)
     {
-      ferr("Response error %08x\n", resp);
+      ferr("Response error %08" PRIx32 "\n", resp);
       return -EIO;
     }
 
@@ -734,7 +735,7 @@ static int cxd56_emmc_readsectors(FAR struct cxd56_emmc_state_s *priv,
   if (idsts &
       (EMMC_IDSTS_FBE | EMMC_IDSTS_DU | EMMC_IDSTS_CES | EMMC_IDSTS_AIS))
     {
-      ferr("DMA status failed. %08x\n", idsts);
+      ferr("DMA status failed. %08" PRIx32 "\n", idsts);
       ret = -EIO;
     }
 
@@ -747,7 +748,7 @@ static int cxd56_emmc_readsectors(FAR struct cxd56_emmc_state_s *priv,
 
 #if !defined(CONFIG_MMCSD_READONLY)
 static int cxd56_emmc_writesectors(FAR struct cxd56_emmc_state_s *priv,
-                                   const void *buf, size_t start_sector,
+                                   const void *buf, blkcnt_t start_sector,
                                    unsigned int nsectors)
 {
   struct emmc_dma_desc_s *descs;
@@ -797,7 +798,7 @@ static int cxd56_emmc_writesectors(FAR struct cxd56_emmc_state_s *priv,
   if (idsts &
       (EMMC_IDSTS_FBE | EMMC_IDSTS_DU | EMMC_IDSTS_CES | EMMC_IDSTS_AIS))
     {
-      ferr("DMA status error. %08x\n", idsts);
+      ferr("DMA status error. %08" PRIx32 "\n", idsts);
       ret = -EIO;
     }
 
@@ -866,7 +867,7 @@ static int cxd56_emmc_close(FAR struct inode *inode)
 }
 
 static ssize_t cxd56_emmc_read(FAR struct inode *inode,
-                               unsigned char *buffer, size_t start_sector,
+                               unsigned char *buffer, blkcnt_t start_sector,
                                unsigned int nsectors)
 {
   FAR struct cxd56_emmc_state_s *priv;
@@ -875,7 +876,7 @@ static ssize_t cxd56_emmc_read(FAR struct inode *inode,
   DEBUGASSERT(inode && inode->i_private);
   priv = (FAR struct cxd56_emmc_state_s *)inode->i_private;
 
-  finfo("Read sector %d (%d sectors) to %p\n",
+  finfo("Read sector %" PRIu32 " (%u sectors) to %p\n",
         start_sector, nsectors, buffer);
 
   ret = cxd56_emmc_readsectors(priv, buffer, start_sector, nsectors);
@@ -891,7 +892,7 @@ static ssize_t cxd56_emmc_read(FAR struct inode *inode,
 #if !defined(CONFIG_MMCSD_READONLY)
 static ssize_t cxd56_emmc_write(FAR struct inode *inode,
                                 const unsigned char *buffer,
-                                size_t start_sector,
+                                blkcnt_t start_sector,
                                 unsigned int nsectors)
 {
   FAR struct cxd56_emmc_state_s *priv;
@@ -900,7 +901,7 @@ static ssize_t cxd56_emmc_write(FAR struct inode *inode,
   DEBUGASSERT(inode && inode->i_private);
   priv = (FAR struct cxd56_emmc_state_s *)inode->i_private;
 
-  finfo("Write %p to sector %d (%d sectors)\n", buffer,
+  finfo("Write %p to sector %" PRIu32 " (%u sectors)\n", buffer,
         start_sector, nsectors);
 
   ret = cxd56_emmc_writesectors(priv, buffer, start_sector, nsectors);
diff --git a/arch/arm/src/lc823450/lc823450_mmcl.c b/arch/arm/src/lc823450/lc823450_mmcl.c
index 529d8409415d9..f63c03f2290c9 100644
--- a/arch/arm/src/lc823450/lc823450_mmcl.c
+++ b/arch/arm/src/lc823450/lc823450_mmcl.c
@@ -61,9 +61,9 @@ struct mmcl_dev_s
 static int     mmcl_open(FAR struct inode *inode);
 static int     mmcl_close(FAR struct inode *inode);
 static ssize_t mmcl_read(FAR struct inode *inode, unsigned char *buffer,
-                         size_t start_sector, unsigned int nsectors);
+                         blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t mmcl_write(FAR struct inode *inode,
-                          const unsigned char *buffer, size_t start_sector,
+                          const unsigned char *buffer, blkcnt_t start_sector,
                           unsigned int nsectors);
 static int     mmcl_geometry(FAR struct inode *inode,
                              struct geometry *geometry);
@@ -122,12 +122,12 @@ static int mmcl_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t mmcl_read(FAR struct inode *inode, unsigned char *buffer,
-  size_t start_sector, unsigned int nsectors)
+  blkcnt_t start_sector, unsigned int nsectors)
 {
   ssize_t nread;
   struct mmcl_dev_s *dev;
 
-  finfo("sector: %d nsectors: %d\n", start_sector, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (struct mmcl_dev_s *)inode->i_private;
@@ -135,7 +135,7 @@ static ssize_t mmcl_read(FAR struct inode *inode, unsigned char *buffer,
   nread = MTD_BREAD(dev->mtd, start_sector, nsectors, buffer);
   if (nread != nsectors)
     {
-      finfo("Read %d blocks starting at block %d failed: %d\n",
+      finfo("Read %u blocks starting at block %" PRIu32 " failed: %d\n",
             nsectors, start_sector, nread);
       return -EIO;
     }
@@ -151,13 +151,13 @@ static ssize_t mmcl_read(FAR struct inode *inode, unsigned char *buffer,
  ****************************************************************************/
 
 static ssize_t mmcl_write(FAR struct inode *inode,
-                          const unsigned char *buffer, size_t start_sector,
+                          const unsigned char *buffer, blkcnt_t start_sector,
                           unsigned int nsectors)
 {
   ssize_t nwrite;
   struct mmcl_dev_s *dev;
 
-  finfo("sector: %d nsectors: %d\n", start_sector, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (struct mmcl_dev_s *)inode->i_private;
@@ -165,7 +165,7 @@ static ssize_t mmcl_write(FAR struct inode *inode,
   nwrite = MTD_BWRITE(dev->mtd, start_sector, nsectors, buffer);
   if (nwrite != nsectors)
     {
-      finfo("Write %d blocks starting at block %d failed: %d\n",
+      finfo("Write %u blocks starting at block %" PRIu32 " failed: %d\n",
             nsectors, start_sector, nwrite);
       return -EIO;
     }
@@ -199,7 +199,7 @@ static int mmcl_geometry(FAR struct inode *inode, struct geometry *geometry)
       finfo("available: true mediachanged: false writeenabled: %s\n",
             geometry->geo_writeenabled ? "true" : "false");
 
-      finfo("nsectors: %d sectorsize: %d\n",
+      finfo("nsectors: %" PRIu32 " sectorsize: %" PRIi16 "\n",
             geometry->geo_nsectors, geometry->geo_sectorsize);
 
       return OK;
diff --git a/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c b/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
index c6d45b65be54f..9abf64d59f748 100644
--- a/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
+++ b/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
@@ -85,9 +85,9 @@ static int     eeed_close(FAR struct inode *inode);
 #endif
 
 static ssize_t eeed_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                 size_t start_sector, unsigned int nsectors);
+                 blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t eeed_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t start_sector,
+                 FAR const unsigned char *buffer, blkcnt_t start_sector,
                  unsigned int nsectors);
 
 static int     eeed_geometry(FAR struct inode *inode,
@@ -215,15 +215,15 @@ static int eeed_close(FAR struct inode *inode)
  ******************************************************************************/
 
 static ssize_t eeed_read(FAR struct inode *inode, unsigned char *buffer,
-                       size_t start_sector, unsigned int nsectors)
+                       blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct eeed_struct_s *dev;
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (FAR struct eeed_struct_s *)inode->i_private;
 
-  finfo("sector: %d nsectors: %d sectorsize: %d\n",
-        start_sector, dev->eeed_sectsize, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u sectorsize: %d\n",
+        start_sector, nsectors, dev->eeed_sectsize);
 
   if (start_sector < dev->eeed_nsectors &&
       start_sector + nsectors <= dev->eeed_nsectors)
@@ -251,15 +251,15 @@ static ssize_t eeed_read(FAR struct inode *inode, unsigned char *buffer,
  ******************************************************************************/
 
 static ssize_t eeed_write(FAR struct inode *inode, const unsigned char *buffer,
-                        size_t start_sector, unsigned int nsectors)
+                        blkcnt_t start_sector, unsigned int nsectors)
 {
   struct eeed_struct_s *dev;
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (struct eeed_struct_s *)inode->i_private;
 
-  finfo("sector: %d nsectors: %d sectorsize: %d\n",
-        start_sector, dev->eeed_sectsize, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u sectorsize: %d\n",
+        start_sector, nsectors, dev->eeed_sectsize);
 
   if (start_sector < dev->eeed_nsectors &&
            start_sector + nsectors <= dev->eeed_nsectors)
@@ -312,7 +312,7 @@ static int eeed_geometry(FAR struct inode *inode, struct geometry *geometry)
 
       finfo("available: true mediachanged: false writeenabled: %s\n",
             geometry->geo_writeenabled ? "true" : "false");
-      finfo("nsectors: %d sectorsize: %d\n",
+      finfo("nsectors: %" PRIu32 " sectorsize: %" PRIu16 "\n",
             geometry->geo_nsectors, geometry->geo_sectorsize);
 
       return OK;
diff --git a/drivers/loop/losetup.c b/drivers/loop/losetup.c
index 21417a3214d1a..b2a48b7eca9f0 100644
--- a/drivers/loop/losetup.c
+++ b/drivers/loop/losetup.c
@@ -75,10 +75,10 @@ static int     loop_semtake(FAR struct loop_struct_s *dev);
 static int     loop_open(FAR struct inode *inode);
 static int     loop_close(FAR struct inode *inode);
 static ssize_t loop_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                       size_t start_sector, unsigned int nsectors);
+                       blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t loop_write(FAR struct inode *inode,
                           FAR const unsigned char *buffer,
-                          size_t start_sector, unsigned int nsectors);
+                          blkcnt_t start_sector, unsigned int nsectors);
 static int     loop_geometry(FAR struct inode *inode,
                              FAR struct geometry *geometry);
 
@@ -194,7 +194,7 @@ static int loop_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t loop_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                         size_t start_sector, unsigned int nsectors)
+                         blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct loop_struct_s *dev;
   ssize_t nbytesread;
@@ -248,7 +248,7 @@ static ssize_t loop_read(FAR struct inode *inode, FAR unsigned char *buffer,
 
 static ssize_t loop_write(FAR struct inode *inode,
                           FAR const unsigned char *buffer,
-                          size_t start_sector, unsigned int nsectors)
+                          blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct loop_struct_s *dev;
   ssize_t nbyteswritten;
diff --git a/drivers/mmcsd/mmcsd_sdio.c b/drivers/mmcsd/mmcsd_sdio.c
index dce104b0f94be..7d6ccb38f41b8 100644
--- a/drivers/mmcsd/mmcsd_sdio.c
+++ b/drivers/mmcsd/mmcsd_sdio.c
@@ -212,9 +212,9 @@ static ssize_t mmcsd_flush(FAR void *dev, FAR const uint8_t *buffer,
 static int     mmcsd_open(FAR struct inode *inode);
 static int     mmcsd_close(FAR struct inode *inode);
 static ssize_t mmcsd_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                 size_t startsector, unsigned int nsectors);
+                 blkcnt_t startsector, unsigned int nsectors);
 static ssize_t mmcsd_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t startsector,
+                 FAR const unsigned char *buffer, blkcnt_t startsector,
                  unsigned int nsectors);
 static int     mmcsd_geometry(FAR struct inode *inode,
                  FAR struct geometry *geometry);
@@ -2224,7 +2224,7 @@ static int mmcsd_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
-                          size_t startsector, unsigned int nsectors)
+                          blkcnt_t startsector, unsigned int nsectors)
 {
   FAR struct mmcsd_state_s *priv;
 #if !defined(CONFIG_DRVR_READAHEAD) && defined(CONFIG_MMCSD_MULTIBLOCK_DISABLE)
@@ -2235,7 +2235,7 @@ static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
 
   DEBUGASSERT(inode && inode->i_private);
   priv = (FAR struct mmcsd_state_s *)inode->i_private;
-  finfo("startsector: %d nsectors: %d sectorsize: %d\n",
+  finfo("startsector: %" PRIu32 " nsectors: %u sectorsize: %d\n",
         startsector, nsectors, priv->blocksize);
 
   if (nsectors > 0)
@@ -2304,7 +2304,7 @@ static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
 
 static ssize_t mmcsd_write(FAR struct inode *inode,
                            FAR const unsigned char *buffer,
-                           size_t startsector, unsigned int nsectors)
+                           blkcnt_t startsector, unsigned int nsectors)
 {
   FAR struct mmcsd_state_s *priv;
 #if defined(CONFIG_MMCSD_MULTIBLOCK_DISABLE)
@@ -2420,7 +2420,7 @@ static int mmcsd_geometry(FAR struct inode *inode, struct geometry *geometry)
           finfo("available: true mediachanged: %s writeenabled: %s\n",
                  geometry->geo_mediachanged ? "true" : "false",
                  geometry->geo_writeenabled ? "true" : "false");
-          finfo("nsectors: %lu sectorsize: %d\n",
+          finfo("nsectors: %lu sectorsize: %" PRIi16 "\n",
                  (unsigned long)geometry->geo_nsectors,
                  geometry->geo_sectorsize);
 
diff --git a/drivers/mmcsd/mmcsd_spi.c b/drivers/mmcsd/mmcsd_spi.c
index 812faff2c1997..942966469a94d 100644
--- a/drivers/mmcsd/mmcsd_spi.c
+++ b/drivers/mmcsd/mmcsd_spi.c
@@ -181,10 +181,10 @@ static int      mmcsd_xmitblock(FAR struct mmcsd_slot_s *slot,
 static int       mmcsd_open(FAR struct inode *inode);
 static int       mmcsd_close(FAR struct inode *inode);
 static ssize_t   mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
-                   size_t start_sector, unsigned int nsectors);
+                   blkcnt_t start_sector, unsigned int nsectors);
 #if !defined(CONFIG_MMCSD_READONLY)
 static ssize_t   mmcsd_write(FAR struct inode *inode,
-                   const unsigned char *buffer, size_t start_sector,
+                   const unsigned char *buffer, blkcnt_t start_sector,
                    unsigned int nsectors);
 #endif
 static int       mmcsd_geometry(FAR struct inode *inode,
@@ -1156,7 +1156,7 @@ static int mmcsd_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
-                          size_t start_sector, unsigned int nsectors)
+                          blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct mmcsd_slot_s *slot;
   FAR struct spi_dev_s *spi;
@@ -1166,7 +1166,7 @@ static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
   int    i;
   int ret;
 
-  finfo("start_sector=%d nsectors=%d\n", start_sector, nsectors);
+  finfo("start_sector=%" PRIu32 " nsectors=%u\n", start_sector, nsectors);
 
 #ifdef CONFIG_DEBUG_FEATURES
   if (!buffer)
@@ -1317,7 +1317,7 @@ static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
 #if !defined(CONFIG_MMCSD_READONLY)
 static ssize_t mmcsd_write(FAR struct inode *inode,
                            FAR const unsigned char *buffer,
-                           size_t start_sector, unsigned int nsectors)
+                           blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct mmcsd_slot_s *slot;
   FAR struct spi_dev_s *spi;
@@ -1327,7 +1327,7 @@ static ssize_t mmcsd_write(FAR struct inode *inode,
   int i;
   int ret;
 
-  finfo("start_sector=%d nsectors=%d\n", start_sector, nsectors);
+  finfo("start_sector=%" PRIu32 " nsectors=%u\n", start_sector, nsectors);
 
 #ifdef CONFIG_DEBUG_FEATURES
   if (!buffer)
@@ -1593,8 +1593,8 @@ static int mmcsd_geometry(FAR struct inode *inode, struct geometry *geometry)
   finfo("geo_available:     %d\n", geometry->geo_available);
   finfo("geo_mediachanged:  %d\n", geometry->geo_mediachanged);
   finfo("geo_writeenabled:  %d\n", geometry->geo_writeenabled);
-  finfo("geo_nsectors:      %d\n", geometry->geo_nsectors);
-  finfo("geo_sectorsize:    %d\n", geometry->geo_sectorsize);
+  finfo("geo_nsectors:      %" PRIu32 "\n", geometry->geo_nsectors);
+  finfo("geo_sectorsize:    %" PRIi16 "\n", geometry->geo_sectorsize);
 
   return OK;
 }
diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c
index 2019e026e2fff..c3f6038e1913e 100644
--- a/drivers/mtd/ftl.c
+++ b/drivers/mtd/ftl.c
@@ -84,11 +84,11 @@ static int     ftl_close(FAR struct inode *inode);
 static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
                  off_t startblock, size_t nblocks);
 static ssize_t ftl_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                 size_t start_sector, unsigned int nsectors);
+                 blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
                  off_t startblock, size_t nblocks);
 static ssize_t ftl_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t start_sector,
+                 FAR const unsigned char *buffer, blkcnt_t start_sector,
                  unsigned int nsectors);
 static int     ftl_geometry(FAR struct inode *inode,
                  FAR struct geometry *geometry);
@@ -204,11 +204,11 @@ static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
  ****************************************************************************/
 
 static ssize_t ftl_read(FAR struct inode *inode, unsigned char *buffer,
-                        size_t start_sector, unsigned int nsectors)
+                        blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct ftl_struct_s *dev;
 
-  finfo("sector: %zu nsectors: %d\n", start_sector, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
 
@@ -438,11 +438,11 @@ static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
 
 static ssize_t ftl_write(FAR struct inode *inode,
                          FAR const unsigned char *buffer,
-                         size_t start_sector, unsigned int nsectors)
+                         blkcnt_t start_sector, unsigned int nsectors)
 {
   struct ftl_struct_s *dev;
 
-  finfo("sector: %zu nsectors: %d\n", start_sector, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (struct ftl_struct_s *)inode->i_private;
@@ -479,7 +479,7 @@ static int ftl_geometry(FAR struct inode *inode,
 
       finfo("available: true mediachanged: false writeenabled: %s\n",
             geometry->geo_writeenabled ? "true" : "false");
-      finfo("nsectors: %zu sectorsize: %zu\n",
+      finfo("nsectors: %" PRIu32 " sectorsize: %u\n",
             geometry->geo_nsectors, geometry->geo_sectorsize);
 
       return OK;
diff --git a/drivers/mtd/smart.c b/drivers/mtd/smart.c
index 1f42daf192e88..641f67c54166e 100644
--- a/drivers/mtd/smart.c
+++ b/drivers/mtd/smart.c
@@ -410,9 +410,9 @@ static int     smart_close(FAR struct inode *inode);
 static ssize_t smart_reload(struct smart_struct_s *dev, FAR uint8_t *buffer,
                  off_t startblock, size_t nblocks);
 static ssize_t smart_read(FAR struct inode *inode, unsigned char *buffer,
-                 size_t start_sector, unsigned int nsectors);
+                 blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t smart_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t start_sector,
+                 FAR const unsigned char *buffer, blkcnt_t start_sector,
                  unsigned int nsectors);
 static int     smart_geometry(FAR struct inode *inode,
                  FAR struct geometry *geometry);
@@ -891,11 +891,11 @@ static ssize_t smart_reload(struct smart_struct_s *dev, FAR uint8_t *buffer,
  ****************************************************************************/
 
 static ssize_t smart_read(FAR struct inode *inode, unsigned char *buffer,
-                          size_t start_sector, unsigned int nsectors)
+                          blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct smart_struct_s *dev;
 
-  finfo("SMART: sector: %d nsectors: %d\n", start_sector, nsectors);
+  finfo("SMART: sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
 #ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
@@ -915,7 +915,7 @@ static ssize_t smart_read(FAR struct inode *inode, unsigned char *buffer,
 
 static ssize_t smart_write(FAR struct inode *inode,
                 FAR const unsigned char *buffer,
-                size_t start_sector, unsigned int nsectors)
+                blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct smart_struct_s *dev;
   off_t  alignedblock;
@@ -931,7 +931,7 @@ static ssize_t smart_write(FAR struct inode *inode,
   off_t  mtdstartblock;
   off_t  mtdblockcount;
 
-  finfo("sector: %d nsectors: %d\n", start_sector, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
 #ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
@@ -1062,7 +1062,7 @@ static int smart_geometry(FAR struct inode *inode, struct geometry *geometry)
 
       finfo("available: true mediachanged: false writeenabled: %s\n",
             geometry->geo_writeenabled ? "true" : "false");
-      finfo("nsectors: %d sectorsize: %d\n",
+      finfo("nsectors: %" PRIu32 " sectorsize: %" PRIi16 "\n",
             geometry->geo_nsectors, geometry->geo_sectorsize);
 
       return OK;
diff --git a/drivers/ramdisk.c b/drivers/ramdisk.c
index 5dccdbe11219f..40df070d43746 100644
--- a/drivers/ramdisk.c
+++ b/drivers/ramdisk.c
@@ -84,9 +84,9 @@ static int     rd_close(FAR struct inode *inode);
 #endif
 
 static ssize_t rd_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                 size_t start_sector, unsigned int nsectors);
+                 blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t rd_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t start_sector,
+                 FAR const unsigned char *buffer, blkcnt_t start_sector,
                  unsigned int nsectors);
 static int     rd_geometry(FAR struct inode *inode,
                  FAR struct geometry *geometry);
@@ -225,15 +225,15 @@ static int rd_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t rd_read(FAR struct inode *inode, unsigned char *buffer,
-                       size_t start_sector, unsigned int nsectors)
+                       blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct rd_struct_s *dev;
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (FAR struct rd_struct_s *)inode->i_private;
 
-  finfo("sector: %zd nsectors: %d sectorsize: %d\n",
-        start_sector, dev->rd_sectsize, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u sectorsize: %d\n",
+        start_sector, nsectors, dev->rd_sectsize);
 
   if (start_sector < dev->rd_nsectors &&
       start_sector + nsectors <= dev->rd_nsectors)
@@ -259,15 +259,15 @@ static ssize_t rd_read(FAR struct inode *inode, unsigned char *buffer,
  ****************************************************************************/
 
 static ssize_t rd_write(FAR struct inode *inode, const unsigned char *buffer,
-                        size_t start_sector, unsigned int nsectors)
+                        blkcnt_t start_sector, unsigned int nsectors)
 {
   struct rd_struct_s *dev;
 
   DEBUGASSERT(inode && inode->i_private);
   dev = (struct rd_struct_s *)inode->i_private;
 
-  finfo("sector: %zd nsectors: %d sectorsize: %d\n",
-        start_sector, dev->rd_sectsize, nsectors);
+  finfo("sector: %" PRIu32 " nsectors: %u sectorsize: %d\n",
+        start_sector, nsectors, dev->rd_sectsize);
 
   if (!RDFLAG_IS_WRENABLED(dev->rd_flags))
     {
@@ -314,7 +314,7 @@ static int rd_geometry(FAR struct inode *inode, struct geometry *geometry)
 
       finfo("available: true mediachanged: false writeenabled: %s\n",
             geometry->geo_writeenabled ? "true" : "false");
-      finfo("nsectors: %zd sectorsize: %zd\n",
+      finfo("nsectors: %" PRIu32 " sectorsize: %" PRIi16 "\n",
             geometry->geo_nsectors, geometry->geo_sectorsize);
 
       return OK;
diff --git a/drivers/usbhost/usbhost_storage.c b/drivers/usbhost/usbhost_storage.c
index 967daeff38b75..7fef5421c710e 100644
--- a/drivers/usbhost/usbhost_storage.c
+++ b/drivers/usbhost/usbhost_storage.c
@@ -170,10 +170,10 @@ static inline void usbhost_requestsensecbw(FAR struct usbmsc_cbw_s *cbw);
 static inline void usbhost_testunitreadycbw(FAR struct usbmsc_cbw_s *cbw);
 static inline void usbhost_readcapacitycbw(FAR struct usbmsc_cbw_s *cbw);
 static inline void usbhost_inquirycbw (FAR struct usbmsc_cbw_s *cbw);
-static inline void usbhost_readcbw (size_t startsector, uint16_t blocksize,
+static inline void usbhost_readcbw (blkcnt_t startsector, uint16_t blocksize,
                                     unsigned int nsectors,
                                     FAR struct usbmsc_cbw_s *cbw);
-static inline void usbhost_writecbw(size_t startsector, uint16_t blocksize,
+static inline void usbhost_writecbw(blkcnt_t startsector, uint16_t blocksize,
                                     unsigned int nsectors,
                                     FAR struct usbmsc_cbw_s *cbw);
 
@@ -231,11 +231,11 @@ static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass);
 static int usbhost_open(FAR struct inode *inode);
 static int usbhost_close(FAR struct inode *inode);
 static ssize_t usbhost_read(FAR struct inode *inode,
-                            FAR unsigned char *buffer, size_t startsector,
+                            FAR unsigned char *buffer, blkcnt_t startsector,
                             unsigned int nsectors);
 static ssize_t usbhost_write(FAR struct inode *inode,
                              FAR const unsigned char *buffer,
-                             size_t startsector, unsigned int nsectors);
+                             blkcnt_t startsector, unsigned int nsectors);
 static int usbhost_geometry(FAR struct inode *inode,
                             FAR struct geometry *geometry);
 static int usbhost_ioctl(FAR struct inode *inode, int cmd,
@@ -629,7 +629,7 @@ static inline void usbhost_inquirycbw (FAR struct usbmsc_cbw_s *cbw)
 }
 
 static inline void
-usbhost_readcbw (size_t startsector, uint16_t blocksize,
+usbhost_readcbw (blkcnt_t startsector, uint16_t blocksize,
                  unsigned int nsectors, FAR struct usbmsc_cbw_s *cbw)
 {
   FAR struct scsicmd_read10_s *rd10;
@@ -651,7 +651,7 @@ usbhost_readcbw (size_t startsector, uint16_t blocksize,
 }
 
 static inline void
-usbhost_writecbw(size_t startsector, uint16_t blocksize,
+usbhost_writecbw(blkcnt_t startsector, uint16_t blocksize,
                  unsigned int nsectors, FAR struct usbmsc_cbw_s *cbw)
 {
   FAR struct scsicmd_write10_s *wr10;
@@ -2024,7 +2024,7 @@ static int usbhost_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t usbhost_read(FAR struct inode *inode, unsigned char *buffer,
-                            size_t startsector, unsigned int nsectors)
+                            blkcnt_t startsector, unsigned int nsectors)
 {
   FAR struct usbhost_state_s *priv;
   FAR struct usbhost_hubport_s *hport;
@@ -2037,7 +2037,7 @@ static ssize_t usbhost_read(FAR struct inode *inode, unsigned char *buffer,
   DEBUGASSERT(priv->usbclass.hport);
   hport = priv->usbclass.hport;
 
-  uinfo("startsector: %d nsectors: %d sectorsize: %d\n",
+  uinfo("startsector: %" PRIu32 " nsectors: %u sectorsize: %" PRIu16 "\n",
         startsector, nsectors, priv->blocksize);
 
   /* Check if the mass storage device is still connected */
@@ -2137,14 +2137,14 @@ static ssize_t usbhost_read(FAR struct inode *inode, unsigned char *buffer,
 
 static ssize_t usbhost_write(FAR struct inode *inode,
                              FAR const unsigned char *buffer,
-                             size_t startsector, unsigned int nsectors)
+                             blkcnt_t startsector, unsigned int nsectors)
 {
   FAR struct usbhost_state_s *priv;
   FAR struct usbhost_hubport_s *hport;
   ssize_t nbytes;
   int ret;
 
-  uinfo("sector: %zu nsectors: %u\n", startsector, nsectors);
+  uinfo("sector: %" PRIu32 " nsectors: %u\n", startsector, nsectors);
 
   DEBUGASSERT(inode && inode->i_private);
   priv = (FAR struct usbhost_state_s *)inode->i_private;
@@ -2271,7 +2271,7 @@ static int usbhost_geometry(FAR struct inode *inode,
           geometry->geo_sectorsize    = priv->blocksize;
           usbhost_givesem(&priv->exclsem);
 
-          uinfo("nsectors: %ld sectorsize: %d\n",
+          uinfo("nsectors: %ld sectorsize: %" PRIi16 "n",
                  (long)geometry->geo_nsectors, geometry->geo_sectorsize);
         }
     }
diff --git a/fs/driver/fs_blockpartition.c b/fs/driver/fs_blockpartition.c
index 3c14c357aaa17..b277c6fec97bb 100644
--- a/fs/driver/fs_blockpartition.c
+++ b/fs/driver/fs_blockpartition.c
@@ -54,9 +54,9 @@ struct part_struct_s
 static int     part_open(FAR struct inode *inode);
 static int     part_close(FAR struct inode *inode);
 static ssize_t part_read(FAR struct inode *inode, FAR unsigned char *buffer,
-                 size_t start_sector, unsigned int nsectors);
+                 blkcnt_t start_sector, unsigned int nsectors);
 static ssize_t part_write(FAR struct inode *inode,
-                 FAR const unsigned char *buffer, size_t start_sector,
+                 FAR const unsigned char *buffer, blkcnt_t start_sector,
                  unsigned int nsectors);
 static int     part_geometry(FAR struct inode *inode,
                  FAR struct geometry *geometry);
@@ -139,7 +139,7 @@ static int part_close(FAR struct inode *inode)
  ****************************************************************************/
 
 static ssize_t part_read(FAR struct inode *inode, unsigned char *buffer,
-                         size_t start_sector, unsigned int nsectors)
+                         blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct part_struct_s *dev = inode->i_private;
   FAR struct inode *parent = dev->parent;
@@ -163,7 +163,7 @@ static ssize_t part_read(FAR struct inode *inode, unsigned char *buffer,
 
 static ssize_t part_write(FAR struct inode *inode,
                           FAR const unsigned char *buffer,
-                          size_t start_sector, unsigned int nsectors)
+                          blkcnt_t start_sector, unsigned int nsectors)
 {
   FAR struct part_struct_s *dev = inode->i_private;
   FAR struct inode *parent = dev->parent;
diff --git a/fs/partition/partition.h b/fs/partition/partition.h
index 6f3392d1bf9dc..df5d9174a3799 100644
--- a/fs/partition/partition.h
+++ b/fs/partition/partition.h
@@ -39,8 +39,8 @@ struct partition_state_s
 {
   FAR struct mtd_dev_s *mtd;
   FAR struct inode *blk;
-  size_t nblocks;
-  size_t blocksize;
+  blkcnt_t nblocks;
+  blksize_t blocksize;
   size_t erasesize;
 };
 
diff --git a/include/nuttx/fs/fs.h b/include/nuttx/fs/fs.h
index 4bba51ad24326..193699d5be6c5 100644
--- a/include/nuttx/fs/fs.h
+++ b/include/nuttx/fs/fs.h
@@ -206,11 +206,11 @@ struct file_operations
 #ifndef CONFIG_DISABLE_MOUNTPOINT
 struct geometry
 {
-  bool   geo_available;    /* true: The device is available */
-  bool   geo_mediachanged; /* true: The media has changed since last query */
-  bool   geo_writeenabled; /* true: It is okay to write to this device */
-  size_t geo_nsectors;     /* Number of sectors on the device */
-  size_t geo_sectorsize;   /* Size of one sector */
+  bool      geo_available;    /* true: The device is available */
+  bool      geo_mediachanged; /* true: The media has changed since last query */
+  bool      geo_writeenabled; /* true: It is okay to write to this device */
+  blkcnt_t  geo_nsectors;     /* Number of sectors on the device */
+  blksize_t geo_sectorsize;   /* Size of one sector */
 };
 
 /* This structure is provided by block devices when they register with the
@@ -225,9 +225,9 @@ struct block_operations
   int     (*open)(FAR struct inode *inode);
   int     (*close)(FAR struct inode *inode);
   ssize_t (*read)(FAR struct inode *inode, FAR unsigned char *buffer,
-            size_t start_sector, unsigned int nsectors);
+            blkcnt_t start_sector, unsigned int nsectors);
   ssize_t (*write)(FAR struct inode *inode, FAR const unsigned char *buffer,
-            size_t start_sector, unsigned int nsectors);
+            blkcnt_t start_sector, unsigned int nsectors);
   int     (*geometry)(FAR struct inode *inode, FAR struct geometry
                       *geometry);
   int     (*ioctl)(FAR struct inode *inode, int cmd, unsigned long arg);