Dismount a USB Volume from Command-line

Question

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

Solution 1

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."

Solution 2

You can use DevEject.

Solution 3

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.)

Comments

[user1686]

AFAIK, neither DOS nor COMMAND.COM support USB flash drives. Did you mean cmd.exe?

[MaQleod]

Check this out: stackoverflow.com/questions/296560/… and also check this out: portableapps.com/node/639

[user1686]

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.