Hi,
Thanks very much for your information.
Per my experience, this issue may be due to multiple hard disks.
By default, MDT Litetouch New Computer Scenario will deploy to disk 0 (the first disk). However, for multiple disks computer, the order of the disks could change depending on the load order of the storage drivers. Depending on the timing, Disk 0 could come up first, or could come up last, there is no way to force the disk ordering. So if we want to target a specific disk we need to change MDT.
For more information, please refer to: ZTISelectBootDisk.wsf
Note: This is non-Microsoft link, just for your reference. Thanks for your time.
Best regards,
Simon
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