Which /dev/... file it is on will depend on the hardware/bios setup of your machine. A first guess would be that the one you want, once booted into a replacement hard drive, is on /dev/hdb. Try
as root, to give you a list of hard drives and the partitions on them. Hopefully you know something about the filesystem(s) used on the 'problematic disk' so you would then be able to mount the partition on a temporary directory and have a look at what is there:
Code:
mkdir /mnt/temp1
mount -t ext2 /dev/hdb1 /mnt/temp1
where ext2 is the filesystem - change to ext3, jfs, rfs, or whatever was used.
Then have a look, see what's on the disk, there must be something that you can use to identify it:
Code:
cd /mnt/temp1
ls -l
You can find out which device your current active (replacement hard drive) file system is on, just by:
without any parameters. That will tell you which drive *not* to touch.
How far does that get you?