DLLS - DriveLetterLessSync

Description

DLLS offers synchronization for files and folders between normal and unmounted (drive letter less) volumes. The whole application is PathTooLong safe and will accept normal drive letters (C:\ or similar) and volume IDs (guid like \\?\Volume{1b3b1146-4076-11e1-84aa-806e6f6e6963}\). This way it provides a snapshot-like RAID-1 experience without any of the downsides as both drives can be completely individually controlled and the second drive can be unmounted (hidden in Windows) while still being accessible.

---

Usage

#!
DLLSCLI SourceDrive DestinationDrive [-S] [-NL] [-NS] [-ON] [-IT] [-IS] [-H Hash]

#!
? / HELP            shows helpfile
D / DRIVES          print all volume-GUIDs including existing mountpoints
S / SILENT          suppress all output and window
NL / NO LOG         do not create log-file
NS / NO SYNC        compare files but do not sync
ON / ONLY NEW       only copy new files, do not compare existing files
IT / IGNORE TIME    ignore file modification time
IS / IGNORE SIZE    ignore file size
H Hash / HASH Hash  use checksums to compare files, available hashing algorithms: MD5, SHA1, SHA256

Examples:

#!
DLLSCLI D:\ \\?\Volume{1b3b1146-4076-11e1-84aa-806e6f6e6963}\ -NL

Finding volume ID

You can pass -D to get a list of all hard drives including their ID and mountpoint. Alternatively call mountvol via commandline for the same result.

These IDs can be used to open an explorer window, independent from the drive letter:

Schedule DLLS to run automatically

Use Windows Task Scheduler and create a Basic Task. Enter a name and a description, "When I log on" as Trigger, "Start a program" as Action. Select DLLScli.exe and add your drives as arguments´. Save your Task. DLLS will sync automatically after logging on now.

Limitations

• empty folders on source drive will not be synchronized
• folder attributes (hidden etc.) will not be synchronized
• files which are currently being written or flagged as inaccessible by a 3rd party application can not be synchronized
• you should not use the drives while synchronization is in progress (possible file exceptions)
• using hash function is not recommended (slow), only use it if you absolutely have to
• you obviously can't delete files on destination drive if they were flagged as read-only by an administrator and you are running DLLS as normal user
• in some rare cases DLLS may fail to delete a folder on destination drive (not existing on source drive). This should be resolved on the next start-up.