How to disconnect a hard via commandline?

I have a portable USB drive that I am using for backups. I would like to schedule a auto disconnect of the drive so that when a user pulls the drive to take home the unit disconnects properly. The backup software does not seem to allow this.

Is there a way to do this via command line?

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or more simply
look down to the "Automating work with devices"
Good luck!

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Steves' answer looks pretty good too,
just in case you get lost in the thread he sent,
click this link (it's dog slow!)
download the file referenced in the top of the text and follow the steps :) might still be good if you have trouble with that.
if those don't help, try task scheduler to run a command to disconnect the USB, which can be done through windows services -- but the utilities are probably easier than windows services.
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