Question re data loss on hard drive

A hard drive with lots of data on it somehow has gone into a mode where when I plug it in it says 'the disc you have inserted is unreadable by this computer: 'Initialise, Eject,' etc - strange thing is I didn't do anything to this disc, but to another disc in the same caddy.
Is there anything I can do about this (I have Disc warrior), or will I have to send the disc for data recovery, and if i does anyone know if they will be able to recover the data?

Give DW a try for sure, might even try Scavenge mode, holding Option/alt key when selecting it.
Data recovery services should work if it wasn't somehow Zeroed out.
Data Rescue...
http://www.prosofteng.com/products/data_rescue.php
(Has a Free Demo to see if it could or not, but you'll need another drive to recover to).
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
http://discussions.apple.com/thread.jspa?messageID=11073082#11073082

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