Progress during large file copy (Copy-Item & Write-Progress?)

It seems like a much better solution to just use BitsTransfer, it seems to come OOTB on most Windows machines with PowerShell 2.0 or greater.

Import-Module BitsTransferStart-BitsTransfer -Source $Source -Destination $Destination -Description "Backup" -DisplayName "Backup"

I haven't heard about progress with Copy-Item. If you don't want to use any external tool, you can experiment with streams. The size of buffer varies, you may try different values (from 2kb to 64kb).

function Copy-File {    param( [string]$from, [string]$to)    $ffile = [io.file]::OpenRead($from)    $tofile = [io.file]::OpenWrite($to)    Write-Progress -Activity "Copying file" -status "$from -> $to" -PercentComplete 0    try {        [byte[]]$buff = new-object byte[] 4096        [long]$total = [int]$count = 0        do {            $count = $ffile.Read($buff, 0, $buff.Length)            $tofile.Write($buff, 0, $count)            $total += $count            if ($total % 1mb -eq 0) {                Write-Progress -Activity "Copying file" -status "$from -> $to" `                   -PercentComplete ([long]($total * 100 / $ffile.Length))            }        } while ($count -gt 0)    }    finally {        $ffile.Dispose()        $tofile.Dispose()        Write-Progress -Activity "Copying file" -Status "Ready" -Completed    }}

Alternativly this option uses the native windows progress bar...

$FOF_CREATEPROGRESSDLG = "&H0&"$objShell = New-Object -ComObject "Shell.Application"$objFolder = $objShell.NameSpace($DestLocation) $objFolder.CopyHere($srcFile, $FOF_CREATEPROGRESSDLG)