UPDATE: I've now tried disconnecting all other HD's and changing the SATA connection of the problem drive and booting the gparted CD. No change. The PC BIOS also thinks the HD is a 4GB drive instead of 2TB...so that can't be good. I tried Acronis Disk Director in Windows....no good. 

Norton's/Symantec bought Partition Magic....and killed it off...so can't try that, either. 

Unless something new comes up....this thing is a paperweight. 

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I have a PC dual-booting Windows Vista Home Premium and Ubuntu 10.10.

A couple of weeks ago I added a 2TB internal SATA drive and mounted as an NT mount point in a folder on my H: drive (the Windows Vista system drive).

I hadn't used NT mount points before and vaguely remember people telling me they could be dangerous....but, I thought, that was years ago and things will probably have moved on a wee bit.

For whatever reason. the mount point is no longer accessible as data space. The partition I created on it has effectively disappeared in Windows. Only the unallocated fragment of the disk is still seen by the Windows system. It drive itself is present in the BIOS.

I can't re-partition the drive as neither Windows nor Linux can see more than the tiny fragment that wasn't originally allocated by me to a partition. 

Storage management in Windows (and Disk Utility in Linux) now see only a 4.1GB unallocated disk space without a partition. The rest of the 2TB drive is invisible to both Windows and Linux. I should say I did not attempt to access this drive from Linux, though the system itself may have detected it and "had a look".  

Anyone have any advice? Is the drive ker-phecked? Or can I recover it?