My hard disk won't display the data in it.

Hello,

I have a seagate HD 250gb. I had slaved it in a machine running on windows xp professional. It suddenly failed to read and write info. via the network since I had shared it. Since then it detects and shows as drive D without giving its name and if I try to browse it, It shows that the drive is inaccessible. you need to format it. I have tried to run CHKDSK /f to try and fix the problem but all in vain.

Please help. It contains very vital data that I cannot trace anywhere else.