PowerShell for Windows Admins

Jul 7 2011   2:18PM GMT

Next drive letter

Richard Siddaway Richard Siddaway Profile: Richard Siddaway

I’ve been working on using the Hyper-V PowerShell library and wanted to use the Mount-VHD function.  It wants a drive letter.  The library provides Get-FirstAvailableDriveLetter but what I want is actually the next letter in the sequence.  I want to avoid A & B to avoid confusion. So I needed a function to get the next drive letter

function get-nextdriveletter {            
$disk = Get-WmiObject -Class Win32_LogicalDisk |            
sort DeviceId -Descending |            
select -First 1 -Property DeviceID            
$letter = ($disk.DeviceID).Substring(0,1).ToUpper()            
if ($letter -eq "Z"){            
 Write-Host "No more drive letters available"            
else {            
 $nextletter = [char](([byte][char]$letter) + 1)            

Use WMI to get the last letter used – descending sort on DeviceID produces that. Take the letter, convert to a byte value, add 1 and convert back

Job done

 Comment on this Post

There was an error processing your information. Please try again later.
Thanks. We'll let you know when a new response is added.
Send me notifications when other members comment.

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Forgot Password

No problem! Submit your e-mail address below. We'll send you an e-mail containing your password.

Your password has been sent to:

Share this item with your network: