Have a look IF this helps:

SYMPTOMS
When booting up to Win XP you may get a error that reads "Unmountable Boot Volume".

CAUSE
1.The file system is damaged and cannot be mounted.
2.You use a standard 40-wire connector cable to connect the UDMA drive to the controller instead of the required 80-wire, 40-pin cable.
3.The basic input/output system (BIOS) settings are configured to force the faster UDMA modes.

More: http://support.microsoft.com/default.aspx/kb/555302