Windows 7 switch from IDE to AHCI

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Windows 7 switch from IDE to AHCI


 1) Run the Registry Editor (regedit.exe)
2) Navigate to Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
3) Set the "Start" value to 0 (zero)
4) Navigate to Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Pciide
5) Set the "Start" value to 0 (zero)
6) Shut down
7) Start up again, but before Windows boots go into the BIOS configuration screens and change the disk mode to "AHCI". Save the new BIOS configuration and restart so that Windows boots.

AHCI vs. IDE


 AHCI and IDE are two modes in which a hard drive communicates with the rest of the computer system using a SATA storage controller. SATA hard drivescan operate in a backward-compatible PATA/IDE mode, a standard AHCI mode or vendor-specific RAID. AHCI stands for Advanced Host Controller Interface and is a faster mode of operation compared to IDE. RAID mode also enables and makes use of AHCI.

Comparison chart

AHCI

IDE
Stands for / AKAAdvanced Host Controller InterfaceIDE: Integrated Drive Electronics / PATA: Parallel Advanced Technology Attachment
AdvantagesSupports new technologies such as native command queuingMaximum compatibility
Hot plugging (add/remove component while the computer is running)SupportedIDE interface does not support hot plugging
DisadvantagesNot always compatibleLacks support for new technology such as native command queuing and hot-plugging hard drives
Defined byIntelWestern Digital
InvolvesOperation of Serial ATA (SATA)host bus adaptorsOperation of a parallel ATA drive
Operating modesLegacy Parallel ATA emulation, standard AHCI or vendor specific RAIDIDE
Operating system supportWindows Vista, 7, and 8; Linux, OpenBSD, NetBSD, FreeBSD, OS Z, eComStation and Solaris 10All

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