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I'm trying to convert a disk from basic to dynamic to mirror two volumes on another disk of equal size. I have used the disk before, but it is currently wiped clean, not even partitioned.

In disk management I see "465.32 GB - Unallocated" and "450 MB - Healthy (Recovery Partition)" on the disk.

When I try to convert it into a dynamic disk I get an error saying there isn't enough space on the disk.

Where do I even start to troubleshoot this? I'm on Windows 10 and I have used this particular disk for this very purpose before.

Christian Lundahl
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    I did solve this problem. I used the disk with "Storage Spaces". That also wiped the disk clean INCLUDING the Recovery Partition. I then deleted the storage space it was included in and went back to Disk Management. Behold! The last recovery partition was gone I could convert the disk to a dynamic one. – Christian Lundahl Jun 09 '16 at 20:37

1 Answers1

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You get this problem when you have a large unallocated space. Create a dummy volume in this space, and then you will be able to convert the disk to dynamic. You can then delete the dummy volume if you want.

Bruce
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  • Unfortunately this doesn't help when you already have 4 partitions (such as the 4 that Windows installs by default), are trying to add a fifth partition and get prompted to first convert the disk to "Dynamic". When trying to do so you get the error about not enough space. Unfortunately you can't create a dummy volume in this case. But perhaps I could extend the main system volume to cover that space. Not sure if that fixes it, but I might give it a try, as long as I can shrink it later. – Simon E. Jun 16 '22 at 10:59