Recover data from failed Hard disk in SCO OpenServer 5.06

One hard disk fail to mount (/dev/data). I had run "fsck /dev/data" then some error occured "unrecoverable error reading SCSI Disk 1 dev 1/104".
I need to recover data from disk. please help.

What is the make/model of the disk, and what host adapter if it is SCSI