# initial status bar
Write-Progress -activity "Getting inventory" -status "Starting" -id 1

# get computer names
$computers = Get-Content c:\computers.txt

# how many computers?
$qty = $computers | Measure-Object
$currentComputer = 1

foreach ($computer in $computers) {
    # calculate status
    [int]$pct = ($currentComputer / $qty.count) * 100
    # update status bar
    Write-Progress -activity "Getting inventory" -status $computer -id 1 -percent $pct
    # get service pack
    Write-Progress -activity "Getting inventory" -status $computer -id 1 -percent $pct '
       -current "Service Pack"
    $wmi = gwmi win32_operatingsystem -computer $computer
    write 'n
    write $computer
    write "Service Pack: " $wmi.servicepackmajorversion
    # get disks
    Write-Progress -activity "Getting inventory" -status $computer -id 1 -percent $pct '
       -current "Disks"
    $wmi = gwmi win32_logicaldisk -computer $computer
    Write-Host "Logical disks: "
    foreach ($disk in $wmi) {
        write $disk.deviceid
    }
    # next computer...
    $currentComputer++
}