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Hello, i've had some success deploying WIndows 7 / 8.1 with bitlocker pre-provisioning. However today i've tried to bitlocker a Dell Latitude E6540 laptop and noticed the bitlocker pre provisioning step taking very long. After the wim file and the drivers are applied the disk is only encrypted to 8 % or so. After the setup configuration manager reboot the enable bitlocker ts step fails because the encryption is not completed. I've seen this behavior on older models (eg. Optiplex 960) but i would not have expected this to happen on new hardware. Has anyone experienced something similar ? I'm using: SCCM 2012 R2 on Windows Server 2008 R2 Windows ADK 8.1 Boot Images with MDT Integration (64-Bit) Models i've successfully bitlockered so far: Dell Venue Pro 11 7130 Dell Latitude E7440 Dell Latitude E6520 At first i was suspecting missing cpu features, however it might also be larger and slower disks. On working models the disk is already encrypted when maybe 10 % of the wim file is downloaded. It looks like the encryption initially (after the pre provsion step) does not complete fast enough and when the download starts the system does not keep up downloading, applying and encrypting. If i pause the the task sequence before the first reboot the encryption completes and the task sequence completes successfully.