Lacie Won't Unmount - Applications Running

[gmachen]

I also have a LaCie HD that will not unmount.

Even immediately after a restart, even a Safe Boot.

It is partitioned into two; I can unmount one partition, but the other one that I cannot unmount is one to which I made a bootable backup with SD!

I did the

sudo lsof | grep /Volumes/[volumeName]

... but nothing whatsoever came up:

circulation-1:~ techservicesadmin$ sudo lsof | grep /Volumes/ServerHD\ backup\ 1\ of\ 3/
Password:
circulation-1:~ techservicesadmin$

(I thought maybe it wasn't working, so as a test I launched an app from it and did the lsof again, and I did see the process.)

Also, this is Mac OS X Server 10.4.11. But it also won't unmount from a regular Mac OS X client Mac.

Any other ideas why I can't umount the drive?