Division by 1GB generating 'op_Division' error message This topic contains 2 replies, has 2 voices, and was last updated by Ben Crane 2 years ago. Author Posts January 14, 2016 at 1:25 am #33868 Ben CraneParticipant Hi, Just delving into PS and I'm finding a little bit of inconsistency with how the / 1GB is working: Currently I have: $disk = Get-WmiObject Win32_logicaldisk $diskfreesize = $disk.FreeSpace / 1GB On some machines this works very nicely, no errors, but on others I get the Method invocation failed because [System.Object] doesn't contain a method named 'op_Division'. At .... + $diskfreesize = $diskfreesize_raw / 1GB + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (op_Division:String) , RuntimeException + FullyQualifiedErrorId : MethodNotFound Can anyone help me understand why this is happening? Is it different PS versions? Cheers Ben January 14, 2016 at 1:46 am #33869 Richard SiddawayModerator Which of the 2 lines are you running $diskfreesize = $disk.FreeSpace / 1GB or $diskfreesize = $diskfreesize_raw / 1GB Which versions of PowerShell are you running? Do the disks that fail actually have any free space eg if its a CD it doesn't report any free space January 14, 2016 at 2:11 am #33870 Ben CraneParticipant Hi Richard, Not sure if my last post made it – still can't see it. Your questions made me realised there was a seperate drive which was causing the problems and I didn't specify a filter to only look at C: drive! Thank you for you help – rookie error Author Posts You must be logged in to reply to this topic.