Operating System Deployment


I recently formatted my IBM x220 into IDE on accident, and wanted to change it from IDE to AHCI. This was a simple procedure, noted by MS :

  • Exit all Windows-based programs.
  • Click Start, type regedit in the Start Search box, and then press ENTER.
  • If you receive the User Account Control dialog box, click Continue.
  • Locate and then click one of the following registry subkeys:
  • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
  • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\IastorV
  • In the right pane, right-click Start in the Name column, and then click Modify.
  • In the Value data box, type 0, and then click OK.
  • On the File menu, click Exit to close Registry Editor.
  • Now as you reboot, make sure to change it to AHCI in BIOS, and voila, all should be working.

    2 replies on “Convert SATA IDE to AHCI aka – STOP 0x0000007B INACCESSABLE_BOOT_DEVICE”

    I dont know if this will help you but there are better ways of doing this and automated as well. look up user ‘cdob’ on

    I even have a boot option on my pxe menu which boots into PE and runs checkdisk then runs the script automatically, fixes the hdc driver and then reboots. Makes it easy as to swap motherboards if a customer needs a new one, or if we wanna convert someone to AHCI or vice versa.

    winXP ->

    win7 ->

    Good to know! Our environment doesn’t need something as complex as this, as our script automatically loads a bunch of disk drivers until one catches/loads and continues on the process. So if you swap boards/NICs/etc.

    Leave a Reply

    Your email address will not be published. Required fields are marked *

    This site uses Akismet to reduce spam. Learn how your comment data is processed.