External hard drive won't eject

Hello all,

I've got a Seagate Free Agent Pro external drive (currently connected via eSATA), which solidly refuses to disconnect from the system, using the "safe disconnect" dance.

Whenever I try, after a pause I get the error message: "This device is currently in use. Close any programs or windows that might be using the device, and then try again." I have tried closing just about everything down, but the message still appears.

My question to all the MS gurus out there is as follows:

1) Is there a way to tell if my drive is actually in use? Can I tell which program is using the drive?
2) Can I force-disconnect the drive in such a way that any pending writes are completed? (i.e., not just disconnecting the cable and hoping for the best)

Before you ask, I did look for device-specific drivers on Seagate's web site. No luck. There's some disk management utilities to help manage backups and/or syncs, but no drivers.

Thanks for your help and time,
~ Paul