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OK, the odd stuff seems to happen to me. Not sure if this belongs here or in the deployment forum. The Question: Why would the console output results from a command-line tool need to know the working dir on one system but not the other? Though in the end I solved the issue I still am not understanding why StdoutRead seems to behave differently as I describe below. Preamble: Windows 10 image deployment to two different HP workstation hardware platforms. After deployment set up some disk space using Intel RAID. I script the Intel RSTe client (Intel® Rapid Storage Technology enterprise). Same version of the RSTe client and same storage controller hardware (Intel C600+/C220+ series chipset SATA RAID controller). The only difference is in the driver - one system has 4.2.0.1136 and the other has 5.2.0.1194, but even after I update the older driver the anomaly persists. There are of course other differences - the older system has different CPUs (Xeon E5-2620 vs Xeon Silver 4108), different chipsets, different SMBIOS, etc..). Both have Nvidia Quadro cards with driver 385.90, but the older has 3x P2000 cards and the newer has 3x Quadro M4000 and a Quadro K1200. To script RAID creation and maintenance I have a function that uses StdoutRead with Intels command line client tool "rstcli64.exe". On the older system, the below call to StdoutRead fails. On the newer system, it works. This only started happening on the older hardware when I updated the Windows version 1607 image to build 14393.2189 (but the Windows image used is the same for both hardware targets). $s_DoRST = Run(@ComSpec & " /c " & $s_RSTcmd, "", @SW_HIDE, $STDERR_CHILD + $STDOUT_CHILD) But if I change it to use @ScriptDir as the working dir, it works for both systems. $s_DoRST = Run(@ComSpec & " /c " & $s_RSTcmd, @ScriptDir, @SW_HIDE, $STDERR_CHILD + $STDOUT_CHILD) The code below is the one that works on both systems (hint: the comment " ; this only deals with one device" is because I've no hardware with more than one ATAPI device to test with). $s_RSTExe = ".\rstcli64.exe" ; for production (compiled executable) ; #FUNCTION# ==================================================================================================================== ; Name ..........: GetDiskInfoFromRSTE() ; Description ...: Queries for hard disks attached to the controller ; Syntax ........: GetDiskInfoFromRSTE() ; Parameters ....: None ; Return value...: An array of attached hard disk datas from the RST command line tool without ATAPI devices such as optical drives ; =============================================================================================================================== Func _GetDiskInfoFromRSTE() Local $s_RSTcmd = $s_RSTExe & " -I -d" Local $s_DoRST, $a_RSTDisksTemp, $s_rawdata, $numDISK = 0 If $Debug <> 0 Then ConsoleWrite("Get disk info: " & $s_RSTcmd & @CRLF) ; useful during dev but cannot be used if #requireadmin $s_DoRST = Run(@ComSpec & " /c " & $s_RSTcmd, @ScriptDir, @SW_HIDE, $STDERR_CHILD + $STDOUT_CHILD) ProcessWaitClose($s_DoRST) $s_rawdata = StdoutRead($s_DoRST) $a_RSTDisksTemp = StringSplit($s_rawdata, @CRLF) For $i = $a_RSTDisksTemp[0] To 1 Step -1 ; since we are deleting items, we have to go backwards through the array If $a_RSTDisksTemp[$i] = "" Or $a_RSTDisksTemp[$i] = "--DISK INFORMATION--" Then _ArrayDelete($a_RSTDisksTemp, $i) EndIf Next $a_RSTDisksTemp[0] = UBound($a_RSTDisksTemp) If IsArray($a_RSTDisksTemp) Then For $j = $a_RSTDisksTemp[0] - 1 To 1 Step -1 ; we need to remove the ATAPI device(s), since we delete we have to step through in reverse If StringInStr($a_RSTDisksTemp[$j], "Disk Type: SATA") Then $numDISK = $numDISK + 1 EndIf Next For $j = $a_RSTDisksTemp[0] - 1 To 1 Step -1 ; we need to remove the ATAPI device(s), since we delete we have to step through in reverse If StringInStr($a_RSTDisksTemp[$j], "ATAPI") Then ; we have to delete the ID entry BEFORE and AFTER the ATAPI entry to remove the ATAPI device (always delete from the bottom up!). _ArrayDelete($a_RSTDisksTemp, $j + 1) ; delete entry below _ArrayDelete($a_RSTDisksTemp, $j) ; delete entry _ArrayDelete($a_RSTDisksTemp, $j - 1) ; delete entry above ExitLoop ; this only deals with one device. If there were more we would need to capture all ATAPI device ID locations into another array then delete the original array entries based on the index numbers in the new array. EndIf Next $a_RSTDisksTemp[0] = UBound($a_RSTDisksTemp) If $a_RSTDisksTemp[0] <> 1 Then If $Debug <> 0 Then ConsoleWrite("Found " & $numDISK & " disk(s) attached to controller." & @CRLF) _infoLog("_GetDiskInfoFromRSTE() found " & $numDISK & " disk(s) attached to controller.", $msgSource) Else If $Debug <> 0 Then ConsoleWrite("No disks found to be attached to controller." & @CRLF) _infoLog("No disks found to be attached to controller.", $msgSource) EndIf Else If $Debug <> 0 Then ConsoleWrite("Unable to query RAID controller. Check hardware and version of RST client software." & @CRLF) _errorLog("Unable to query RAID controller. Check hardware.", $msgSource) Exit EndIf Return $a_RSTDisksTemp EndFunc ;==>_GetDiskInfoFromRSTE