Hello forums!
Got a bit of a problem with a WD 2TB HDD. Ever since I moved my computer to my new place I haven't been able to access this drive. It shows in file manager as 'DATA' mounted at sdb1 which would be correct but it seems to always be busy, can't do anything with it. It won't show up in Testdisk or GParted. I managed to unmount it via terminal and still nothing. Originally I was able to view it in Knoppix but the partition table was messed up. I had tried restoring it with Testdisk to no avail. Eventually it stopped showing up in Testdisk and GParted at which point I gave up (A few months ago).

Now I just want my drive back, I've given up on recovering the data (although that would be fantastic) I just can't make do with my little 500 GB backup drive anymore, those 2 TBs would really come in handy. The drive shows in BIOS as well, just not useable from knoppix. It shows in Windows as a drive but has no info. It does have correct information in Knoppix regarding size and gives a believable reading for free space from what I remember.
Does anyone have any clue as to what the problem could be or what I could do to remedy it? I'm sure there's a command result I should be posting but I'm fairly new to Linux, especially Knoppix so treat me as a noob
Let me know if any additional information is required.

Thanks in advance!

System specs:
Asus P6t6 WS mobo
Core i7 920
6 GB Mushkin 1600Mhz RAM
Saphire Radeon HD 4870 2GB
Intel 80 GB SDD (Reserved for Windows and Ubuntu)
WD 500 GB HDD
WD 2 TB HDD (WD20EADS-00R) -Drive in question
Running Knoppix from 1 GB usb stick, kernel version 2.6.36.1