Disk unmounting at logoff, how do I disable this feature?

I noticed one of my 120GB single-partition disks, used solely for backing up another 120GB single-partition boot disc, usually appears on my desktop after a short delay when logging in.
It appears that the disk unmounts every time I log out, and then remounts when any user logs in. I have a nightly backup utility that writes to that disc. When I am logged in, it works fine, but when I am logged off, the backup fails because that destination disk is not available.
Every login reveals this message in /var/log/system.log
Jul 8 07:59:38 gossamer diskarbitrationd[43]: disk1s10 hfs 571D9205-D45D-34A3-8E62-FF642016B325 Seagate /Volumes/Seagate
which seems to be the mounting of the disk, as similar messages appear for the other /Volumes only at startup.
So, does anyone have any ideas how to keep this particular disk mounted when a user logs off? It is connected on the same ribbon cable as my bootable 10.4.7 disk on a Sonnet PCI ATA66 card. I don't remember which is Master or Slave, but that's probably not a factor.

sudo defaults write
/Library/Preferences/SystemConfiguration/autodiskmount
AutomountDisksWithoutUserLogin -bool true
I tried looking at existing defaults with >defaults read
and didn't see any thing to give me an idea of any current setting that I could revert to in case of a problem.
Also, man autodiskmount says:
AUTODISKMOUNT(8) BSD System Manager's Manual AUTODISKMOUNT(8)
NAME
autodiskmount -- disk support tool
SYNOPSIS
autodiskmount
DESCRIPTION
This command is deprecated and exists only for backwards compatibility.
SEE ALSO
fstab(5)
Darwin July 18, 2004 Darwin
So, I am a little uncomfortable messing with these defaults that I don't fully understand, and not sure how to revert to the existing state.
I found the executeable in /sbin/autodiskmount, not in the /System/Library/SystemConfiguration/autodiskmount path. So that suggestion doesn't fully make sense to me. I agree that it should be possible, as I have other Volumes that remain mounted when any user logs off, they are on the on-board ATA interface. Maybe this is a unique issue with my PCI ATA66 card?
G3 Desktop, SonnetEncoreZIF G4 1GHz, 768MB, WingsAV-6MB, DVR-106D, 60GB Maxtor Mac OS X (10.4.7) PCI: TempoUltraATA66-120GB Maxtor, 120GB Seagate; TangoUSB/FW; ATIRadeon-17" LCD

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