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15 Sd-cards.md
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# SD Cards
+## Status table
+
+
+| Size | Mfg | Class | Success | Fail |
+| ---- | -------- | ----- | ------- | ---- |
+| 16GB | Team | 2 | 2 | |
+| 16GB | Kingston | 4 | 1 | 2 |
+| 16GB | SanDisk | | 1 | 4 |
+| 16GB | G.Skill | 6 | 1 | |
+| 16GB | Patriot | | | 1 |
+| 32GB | | | none tried yet |
+
+
+## Description of the problem
+
There have been problems reported with 16 GB cards, possibly this is due to power consumption in some cases. Sometimes a different brand or class will function which might indicate compatibility problems with the SD card controller's implementation of the SPI protocol. The WikiReader does not have a dedicated SD Card interface so must communicate with the Card entirely with SPI; processors with SD Card interface (e.g. PC, USB reader) use SPI only to switch the SD Card out of SPI mode.
One email I received has another possible explanation that the number of sectors is a problem,
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