Switch from IDE to AHCI after installing Windows 7

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\msahci

Change the “Start” DWORD value from 3 to 0

windows 8 and 8.1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\storahci
Change the “Start” DWORD value from 3 to 0

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