Comments on: ‘Add Mirror…’ option is grayed out in Windows’ Disk Management

By: vletroye

vletroye — Sun, 16 Jun 2024 15:29:48 +0000

Interesting finding 🙂

Thx for sharing !

By: Max_fromOz

Max_fromOz — Sat, 15 Jun 2024 13:14:54 +0000

I had tried for hours and was getting nowhere, found the above method and when I deleted the volume and made the drive 100% unallocated then the ‘add mirror’ became a valid option…unfortunately I then got a new error telling me the drives had to be the same format (both drives are GPT, not MBR). At the time I got this error both drives were GPT so it didn’t make any sense. I changed the 2nd drive back to MBR (had it that way originally but had formatted it NTFS, so not unallocated) but got the same error. Changed 2nd drive back to GPT and voila!…suddenly worked fine. Makes no sense but it worked. So if you’re stuck try swapping drive back and forth between MBR and GPT.

By: vletroye

vletroye — Sun, 12 Nov 2023 15:21:05 +0000

In reply to Marc Kircos. I didn't experience such an error myself, so I can't confirm that this solution found on Google will do the trick: "Taking the drive offline in Disk Management, rescanning disks, and placing the drive back online".

By: Marc Kircos

Marc Kircos — Thu, 31 Aug 2023 23:53:55 +0000

Disk to Mirror is 1TB, tried to use a 2TB as the add disk for mirror and received this message: The specified disk extent size exceeds the size of free disk space. What do I try now?

By: clark

clark — Tue, 20 Sep 2022 21:53:28 +0000

you’re a lifesaver! THIS is the solution!

By: amonrei

amonrei — Sun, 27 Feb 2022 13:01:42 +0000

5 years late but thanks. This works. I searched far and wide on the internets for this solution.

By: ivan

ivan — Sat, 31 Oct 2020 19:05:24 +0000

very helpful fixed my issue