Change Drive Letter with PowerShell

scottalanmiller

Had an issue come up with a SAN tonight that mapped to the wrong drive letter and kept a server from coming up. Lots of fun. But it turned out that all I had to do was fixed the drive mapping. No GUI, though, so doing it from the command line was necessary. Here's how to do it.

First we can look at our disk devices with Get-Disk, but this just helps us understand what devices we have and if they are healthy. We can't see what drive letters or filesystems are associated with the devices from here. Think of this as being like lsblk on Linux.

> get-disk

Number Friendly Name Serial Number                    HealthStatus         OperationalStatus      Total Size Partition
                                                                                                             Style
------ ------------- -------------                    ------------         -----------------      ---------- ----------
0      DELL PERC ... 008f58041e8dbf4d1900996254c0110b Healthy              Online                  465.25 GB GPT
1      DELL PERC ... 0006f12d0a4d56cc2000996254c0110b Healthy              Online                    3.64 TB GPT
2      WD My Book... WCC4EJLMCL37                     Healthy              Online                    3.64 TB GPT

To see our file systems is gdr -PSProvider 'Filesystem', this is like the df command on Linux.

> gdr -PSProvider 'Filesystem'

Name           Used (GB)     Free (GB) Provider      Root                                               CurrentLocation
----           ---------     --------- --------      ----                                               ---------------
C                  98.47        366.22 FileSystem    C:\                                                 Users\admin
D                3240.11        484.76 FileSystem    D:\
F                2147.86       1577.99 FileSystem    F:\
G                                      FileSystem    G:\

In my example above, we want to move the F:\ drive to be the E:\ drive. Here is how we do it.

$drv = Get-WmiObject win32_volume -filter 'DriveLetter = "F:"'
$drv.DriveLetter = "E:"
$drv.Put() | out-null

That's it. Not a one liner, but quite easy. PowerShell to the rescue. Run your gdr command again to see the change.

JaredBusch

@scottalanmiller Why not just get-psdrive?

PS C:\WINDOWS\system32> Get-PSDrive

Name           Used (GB)     Free (GB) Provider      Root                                               CurrentLocation
----           ---------     --------- --------      ----                                               ---------------
Alias                                  Alias
C                  55.11         24.35 FileSystem    C:\                                               WINDOWS\system32
Cert                                   Certificate   \
D                                      FileSystem    D:\
E                 971.83        928.05 FileSystem    E:\
Env                                    Environment
Function                               Function
HKCU                                   Registry      HKEY_CURRENT_USER
HKLM                                   Registry      HKEY_LOCAL_MACHINE
Variable                               Variable
WSMan                                  WSMan

dbeato

A WD For backups?

scottalanmiller

@dbeato said in Change Drive Letter with PowerShell:

A WD For backups?

Seems that way.

computerchip

What about using:

Get-Partition -DriveLetter F | Set-Partition -NewDriveLetter E

scottalanmiller

@denis_mcgee said in Change Drive Letter with PowerShell:

Very convenient, as for me

Thanks