Unmounted second hard drive in OS X Tiger

Hello there:
Suddenly the second hard drive in one of my computers, a G4, it's no longer available. This is not the main HD, just a back up drive. Any ideas?
Best wishes, as always,
Federico (aka euskir)

OK, I'll assume you've rebooted already..
As a test, not that we'll actually try to recover anything yet, but there are a few Apps that can adddress a Drive that isn't seen in DU, so try some of these to see what happens.
Data Rescue II...
http://www.prosofteng.com/products/data_rescue.php
This one would require another HD with plenty of space to recover to.
You should use another Boot Disk or other Mac with this one in Target mode to do the recovery.
They have a free demo to see what it could recover.
rccharles on file recovery...
"Stellar Phoenix Macintosh - Mac data recovery software, recovers data from damaged, deleted, or corrupted volumes and even from initialized disks."
They have a trial version, so I guess you can see if your data can be recovered...
http://www.stellarinfo.com/mac-data-recovery.htm
FileSalvage is an extremely powerful Macintosh application for exploring and recovering deleted files from a drive or volume. FileSalvage is designed to restore files that have:
    * been accidentally deleted.
    * become unreadable due to media faults.
    * been stored on a drive before it was re-initialized/formatted.
http://subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products_id= 1

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