During my failed attempt to use Norton Ghost to clone my boot drive, the original disk letter assignments were changed and now Windows 7 can not find my files. The original disk (which I am still using) has a boot/recovery partition assigned as D: and the main partition with all docs/programs/etc. was C:. During the attempted cloning of the new drive, the main partition of the original drive was reassigned to K:, so now Windows 7 can not find it. How can I correct the letter assignment problem?


Open the start menu, right click 'Computer', and click 'Manage'. Wait for a moment while the Microsoft Management Console starts.

In the left pane of the MMC, select 'Storage' > 'Disk Management'. In the lower middle pane, you should see your hard drive (probably Disk 0) with a bar chart representing its partitions. Right click a partition and select 'Change Drive Letter and Paths'. Select the entry with the current letter and press Modify, in the box that opens you'll be able to select a new drive letter.

The old drive letter will continue to work as well as the new one until you restart (to prevent file handles currently open becoming invalid).

  • With only the original drive installed, Windows would not open the desktop/start button/etc. I reconnected the new disk with the copy of the main partition (now called C:) and it booted completely with both disks installed. So, I've followed your instructions to rename the new drive to M: and am trying to rename the old drive's partition to C:. However, Disk Management says, "The parameter is incorrect." Any ideas? – CoryanDesign Jun 8 '11 at 4:36
  • The current state of things is: Old drive has D: (boot partition), K: (original program/data files) and the New drive has M: (a clone of the old disks program and data files). – CoryanDesign Jun 8 '11 at 4:38
  • On a machine I am trying, I am also getting "The parameter is incorrect" when trying to change the letter of the active partition. I suspect that this is a failure to remap the active partition, although I thought this worked. More research shows that people seem to think this is impossible... but I am 100% sure I have done it before. Take a look at this MSKB: support.microsoft.com/default.aspx?scid=kb;en-us;223188#top . Absolutely do perform a backup beforehand. – jcrawfordor Jun 8 '11 at 6:45
  • jcrawfordor, thanks for your help. It seems that while trying to continue with the Ghost cloning process, the computer has, at some point, renamed the partitions again and the C: has been returned to normal. So, problem solved...now back to trying to get this new drive cloned and installed. Thanks. – CoryanDesign Jun 8 '11 at 13:48

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.