It creates a Diskpart configuration text file on the fly in the ‘X:\Windows\Temp’ folder of the running WinPE. The script runs before the Task Sequence begins. I worked around this by creating a PowerShell PreStart script and adding it to the Boot Media ISO image. If the boot images don’t match then SCCM attempts to pre-stage onto the local disk and fails as the OSDisk is unavailable due to it being encrypted with BitLocker (the drive appears as “RAW” and cannot be accessed) and none of the other partitions are large enough or available. Using devices in UEFI mode with BitLocker enabled makes this tricky when the Boot Image associated with the Task Sequence becomes out of sync with the Boot Image on the USB media. A customer recently had a requirement for rebuilds to be done in remote sites via USB flash drives configured as SCCM Bootable Media due to a lack of local SCCM Distribution Points and PXE Boot capability.
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