I was recommended to post this Powershell question here:  https://social.technet.microsoft.com/Forums/windowsserver/en-US/fc79faab-24ab-43a0-b8d4-08ebdff7cae6/powershell-cant-reset-disk?forum=winserverfiles

I need a PowerShell command to do exactly the same thing as clicking Reset on a formatted partition in the Storage Spaces UI. These commands don't work:

Reset-PhysicalDisk physicaldisk1 --> has no effect!

Initialize-Disk 1 -PartitionStyle Unknown  --> error "the disk is already initialized"

Remove-Partition 1 --> prompts endlessly for partition

Read the help and the exampes: https://technet.microsoft.com/en-us/library/hh848660(v=wps.630).aspx

Thanks jrv, but maybe you didn't read my post? reset-physicaldisk "physicaldisk2" has no effect on the CanPool property. In the UI, the partition type is still listed as MBR even after running reset-physicaldisk.

You asked how to reset the disk. Perhaps you are asking the wrong question.  Are you trying to change the partition type?

You might also start by reviewing the blog on  how the CmdLets work: http://blogs.msdn.com/b/san/archive/2012/07/03/managing-storage-with-windows-powershell-on-windows-server-2012.aspx

Thanks jrv. Here's the sequence that worked to change the partition to Unknown. Reset didn't work until after Clear-disk with RemoveData...

get-disk

Clear-Disk 1 -RemoveData    # replace with your disk number

Get-PhysicalDisk | ft FriendlyName,MediaType,Size,CanPool

Reset-PhysicalDisk PhysicalDisk1     # replace with your disk name

• Marked as answer by scottz1 12 hours 12 minutes ago

Which was what I posted originally.