command line to "safely remove hardware"

[mattfromomaha]

The doctor I work for uses a USB digital dictaphone and downloads to his ThinkCentre before sending to the transcriptionist. The dictaphone shows up when docked as a disk drive (e:) and I made a batch file that moves all the voice files from it to the server when he runs the batch.

Question: is there a command I can add to the batch file that would accomplish the same thing as when you click the "Safely Remove Hardware" icon in the system tray and choose to remove the "USB Mass Storage Device"? In theory it would save him one more step, but in practice he doesn't "stop" the device now so this would make his computer happier...

Thanks!