Waking for backup - USB unmounted...sometimes

It will take a couple of more days of experiments to define this problem, but I thought I would go ahead and post.
I have my system (20" Alu iMac) set to sleep after an hour of inactivity and wake up at 12:30am, if needed, to execute a cron job (haven't gotten launchd to work yet - it tries, but the program fails) at 1:00am. The cron job runs rsback, an rsync-based script to save rotating backups (backups need to be accessible by Linux systems in case the iMac fails, so not using TM) to my external USB harddrive - a WD 320GB MyBook. Normally, the external drive is mounted as /Volumes/WD320A.
For the first few days when I logged in in the morning, the backups would appear in a real, local directory /Volumes/WD320A and the USB drive was mounted as "/Volumes/WD320A 1" I suspected the drive was not waking when the computer did to run rsback. But this morning, the backup appeared on the harddrive. The only difference was that I did not log out last night when I finished work. I am suspecting that the drive remains mounted if a user is logged in, but unmounted if no users are logged in. I will have to do some experiments to confirm or deny this. My questions at this point are:
1) Is the USB drive really unmounted if noone is logged in, and does it stay mounted if someone is?
2) Is there command I can use to "tickle" a sleeping or force a mount of the drive prior to executing my backup (which runs as root).

Update. I have confirmed that if no one is logged in, the USB drive is not available for backups executed by cron as root. As long as I don't log out, its there and the backups proceed correctly.
Next step is to see if I can find a shell command to force the mount of the drive just prior to the backup.
Any suggestions?

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