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?

  • I accidentally converted to Dynamic Disk (using Windows's Disk Management). But AOMEI PartitionAssistant Professional app's Dynamic Disk Converter (which can be found in All Tools section) was great and without data loss (but needed restart).
    – Top-Master
    Commented Mar 16, 2021 at 0:11

2 Answers 2


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 after completely backing up and verifying anything you don't want to lose from that drive.

(old instructions removed by Microsoft see Workaround section; ignore the sections about Live OneCare Firewall) for using the dskprob.exe tool from the Windows Support Tools for WinXP.

  1. 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.
  • I can boot it and this information seems promising. I will try it as soon as I get to creating backup. Commented Nov 5, 2009 at 9:25
  • excellent plan. good luck! Commented Nov 5, 2009 at 9:55
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    It did not work for me. It all ended with me just clearing everything and restoring from backup. Commented Nov 20, 2010 at 23:18
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    @quackquixote I can confirm that it works using testdisk. Proof: youtube.com/watch?v=zTwPch9acGc Commented Jan 15, 2016 at 17:56
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    According to arstechnica.com/civis/viewtopic.php?f=20&t=1150673 it loosk like the old instructions of Microsoft just ended up changing the partition type/ID from 42 to 07.
    – TOOGAM
    Commented Apr 24, 2021 at 10:11

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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