Therefore, the drive must now load the Msahci.sys driver. When you change the boot drive to a driver that is disabled, you must enable the new driver before you change the hardware configuration.įor example, assume that you install Windows Vista or Windows 7 on a computer that contains a controller that uses the Pciide.sys driver. This behavior speeds up the operating system's startup process. On the File menu, click Exit to close Registry Editor.ĭuring the Windows 7 or Windows Vista installation process, any unused storage drivers are disabled. In the Value data box, type 0, and then click OK.
In the pane on the right side, right-click Start in the Name column, and then click Modify. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci Locate and then click one of the following registry subkeys: If you receive the User Account Control dialog box, click Continue.
To do this, follow these steps:Ĭlick Start, type regedit in the Start Search box, and then press ENTER. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:ģ22756 How to back up and restore the registry in WindowsTo resolve this issue, enable the AHCI driver in the registry before you change the SATA mode of the boot drive. Then, you can restore the registry if a problem occurs. For added protection, back up the registry before you modify it. Therefore, make sure that you follow these steps carefully. However, serious problems might occur if you modify the registry incorrectly. Important This section, method, or task contains steps that tell you how to modify the registry. This driver must be enabled before you change the SATA/RAID mode of the boot drive. This issue occurs if the disk driver in Windows 7 or Windows Vista is disabled. STOP 0x0000007B INACCESSABLE_BOOT_DEVICE Cause
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