How to get disk capacity and free space of remote computer

Question

Much simpler solution:

Get-PSDrive C | Select-Object Used,Free

and for remote computers (needs Powershell Remoting)

Invoke-Command -ComputerName SRV2 {Get-PSDrive C} | Select-Object PSComputerName,Used,Free

$disk = Get-WmiObject Win32_LogicalDisk -ComputerName remotecomputer -Filter "DeviceID='C:'" |
Select-Object Size,FreeSpace

$disk.Size
$disk.FreeSpace

To extract the values only and assign them to a variable:

$disk = Get-WmiObject Win32_LogicalDisk -ComputerName remotecomputer -Filter "DeviceID='C:'" |
Foreach-Object {$_.Size,$_.FreeSpace}

Just one command simple sweet and clean but this only works for local disks

Get-PSDrive

You could still use this command on a remote server by doing a Enter-PSSession -Computername ServerName and then run the Get-PSDrive it will pull the data as if you ran it from the server.

I created a PowerShell advanced function (script cmdlet) a while back that allows you to query multiple computers.

The code for the function is a little over 100 lines long, so you can find it here: PowerShell version of the df command

Check out the Usage section for examples. The following usage example queries a set of remote computers (input from the PowerShell pipeline) and displays the output in a table format with numeric values in human-readable form:

PS> $cred = Get-Credential -Credential 'example\administrator'
PS> 'db01','dc01','sp01' | Get-DiskFree -Credential $cred -Format | Format-Table -GroupBy Name -AutoSize

   Name: DB01

Name Vol Size  Used  Avail Use% FS   Type
---- --- ----  ----  ----- ---- --   ----
DB01 C:  39.9G 15.6G 24.3G   39 NTFS Local Fixed Disk
DB01 D:  4.1G  4.1G  0B     100 CDFS CD-ROM Disc


   Name: DC01

Name Vol Size  Used  Avail Use% FS   Type
---- --- ----  ----  ----- ---- --   ----
DC01 C:  39.9G 16.9G 23G     42 NTFS Local Fixed Disk
DC01 D:  3.3G  3.3G  0B     100 CDFS CD-ROM Disc
DC01 Z:  59.7G 16.3G 43.4G   27 NTFS Network Connection


   Name: SP01

Name Vol Size   Used   Avail Use% FS   Type
---- --- ----   ----   ----- ---- --   ----
SP01 C:  39.9G  20G    19.9G   50 NTFS Local Fixed Disk
SP01 D:  722.8M 722.8M 0B     100 UDF  CD-ROM Disc