If you are running Windows XP, you could check under Computer Manager, Disk Management and just check that the disk is being recognised correctly. If not, then the issue is likely to be with the DMS, but it could also be a problem with the cradle.
If you are not running XP, then you might need to re-install the cradle drivers - something may have gone awry with your drivers.
If the disk checks out okay, and you've already hacked your PhatBo,x then you might be able to re-partition the disk and at least get it usable again.
If not, then you should beg/borrow/steal an original DMS and hack your box now (and then see if the disk is recoverable).