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How do I unmount a volume (USB flash drive) via command-line or Visual Basic script?

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AFAIK, neither DOS nor COMMAND.COM support USB flash drives. Did you mean cmd.exe? – grawity Mar 30 '11 at 18:41
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Check this out: stackoverflow.com/questions/296560/… and also check this out: portableapps.com/node/639 – MaQleod Mar 30 '11 at 18:42

Check out the two following Windows utilities:

  • Mountvol - "Creates, deletes, or lists a volume mount point."
  • Devcon - "Using DevCon, you can enable, disable, restart, update, remove, and query individual devices or groups of devices."
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Despite the name, mountvol doesn't do the same thing as the other tools (which is to sync and unmount the filesystem); rather it only manages paths through which a mounted filesystem can be accessed. – grawity Mar 31 '11 at 13:06

From a batch script, the easiest way is to call USB Disk Ejector. (Sync might work too, but it wants a drive letter, which is not always predictable.)

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You can use DevEject.

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