Can you dump the hddss.bin off it.
What I would do is dump the hddss.bin off it, Then zero the hdd out. WinHex can do this if you have brought it. Dont think trial does.
Then reinsert the hddss.bin info manually with hex editor.
And remake the partitions with hex editor.
To do this open the hddss.bin file and copy everything.
Then open the hdd and go to location 2000 and paste in the hddss.bin info.
Then go to posision 80000 and enter this
CODE
58 54 41 46 00 00 00 00 00 00 00 10 00 00 00 01
then to posistion 120EB0000 and enter this
CODE
58 54 41 46 FF FF FF FF 00 00 00 20 00 00 00 01
then to 120EB0010 and
CODE
00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF
then to 120EB1000 and
CODE
FF FF FF F8 FF FF FF FF 00 00 00 00 00 00 00 00
then to 120EB1010 and
CODE
FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00
Save that and reattach the hdd and see if it shows up and lets you format it. If not then make partition 3 aswell.
go to 130EB0000 and
CODE
58 54 41 46 FF FF FF FF 00 00 00 20 00 00 00 01
And it should work.
If it doesnt after all that then I dont know could be the hdd has died or the xbox is have trouble with the hdd port connection.