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I converted basic disk to dynamic on my laptop. However, now I cannot install Windows 7 on another partition. I just get message that installing them on dynamic disk is not supported.

Is there a way to convert dynamic disk to basic without losing data on already existing partition?

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up vote 5 down vote accepted

Here are instructions on non-destructively converting dynamic disks to basic disks. There are two methods discussed.


  1. If you can boot your system, follow Microsoft's instructions (see Workaround section; ignore the sections about Live OneCare Firewall) for using the dskprob.exe tool from the Windows Support Tools for WinXP.

  2. If you can't boot, use TestDisk. The first link in this post contains detailed instructions. Essentially, if TestDisk can detect your dynamic disk's partitions, it may be able to write out a new, standard partition table -- converting it to a basic disk.

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I can boot it and this information seems promising. I will try it as soon as I get to creating backup. – Josip Medved Nov 5 '09 at 9:25
excellent plan. good luck! – quack quixote Nov 5 '09 at 9:55
It did not work for me. It all ended with me just clearing everything and restoring from backup. – Josip Medved Nov 20 '10 at 23:18
@quackquixote I can confirm that it works using testdisk. Proof: – Nehal J. Wani Jan 15 at 17:56

here's a freeware which can convert dynamic disk to basic without losing data.

but backing up the disk before converting is quite important.

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They don't offer conversion in free edition any more. – ilyaigpetrov Sep 25 '15 at 9:14

There seem to be ways.

The official one is to back up the data on the disk, re-partition and -format and then restore the data.

If your volume was used in a stripeset (you had a reason to make it a dynamic volume in the first place, right?), then this should be the only pretty way to keep your data.

Otherwise you seem to be able to get creative with a hex editor. I've done that a few years ago myself but be careful and read up a little on how your disk is organized before destroying anything you might want to keep.

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