This thread got me interested in AHCI:
http://forums.anandtech.com/showthread.php?t=2408764
so I switched to ahci in bios and immediately got a BSOD.
I only have a single sata drive.
my mobo is a gigabyte ga-78LMT-sp2.
Whats wrong?
and how much better would my system run on AHCI?
For future reference; if the OS was installed in IDE mode and you would like to switch to AHCI mode just follow this simple five minute procedure:
1. Open regedit.
2. Go to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\msahci
3. Click on msahci, then in the right pane double-click the value Start.
4. Change the Start value data to 0, then click OK.
5. Go to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\IastorV
6. Click on IastorV, then in the right pane double-click the value Start.
7. Change the Start value data to 0, then click OK.
8. Close regedit, then shut down.
9. Restart the computer and immediately enter BIOS setup.
10. Find the SATA storage controller section and change the mode from IDE to AHCI.
11. Save settings and exit BIOS.
This procedure assumes IRST is installed but if not, just skip steps five, six and seven because there won't be a IastorV key in your registry. The msahci key is the critical key to edit. If Windows inadvertently gets booted without saving the IDE to AHCI change in BIOS, the entire procedure will need to be repeated from the beginning.
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