Use DISKPART to bring a disk online

Tue, 27 Nov 2018 14:09:05 +0000

If you’ve recently migrated a VMWare Fusion virtual machine to VMWare ESXi, which itself had multiple disks, you may find that secondary disks don’t show up. You can change this using DISKPART.

In my case, this didn’t happen in a Windows 10 VM with two disks, but did happen in Windows Server 2016 with two disks.

Weird.

Anyway, it’s reasonably easy to fix, using DISKPART.

Open a CMD prompt and type DISKPART
You should got a ACL type auth warning, just OK It
This will open a new console window with DISKPART> prompt
Type LIST DISK
You should see your various disks listed, and one (or more) will be Offline
Type SELECT DISK 1
Type ONLINE DISK
At this point, your disk should appear in Windows Explorer
If you find you cannot create anything on the disk, then it’s possible it’s readonly, in which case
Type ATTRIB DISK CLEAR READONLY

That should be everything you need.

DISKPART on Matt Thornton

Use DISKPART to bring a disk online