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CEHJ
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Tricky SATA drivers problem

This was my scenario when 'downgrading' an Inspiron 1525 from Vista to XP Pro:

http://en.community.dell.com/support-forums/laptop/f/3518/p/18978137/19101123.aspx

I had to try the 'easy way', since the hard way failed for me. All appears to be fine now, but of course i'm left in ATA mode, when i'd like to be in AHCI mode. I tried to install the correct SATA drivers, but when switching back to AHCI, i get a very early BSOD and an endless reboot cycle. Certainly the aforementioned

"if you switch to AHCI in the future windows will crash."

is the case. But i was hoping for a different result since the correct drivers are theoretically in the system. I'm hoping i haven't got a bootstrapping problem here, in that in order  to install the drivers properly, ahci needs to  be enabled and i need to be in Windows ...
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Gary Case

8/22/2022 - Mon
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Gary Case

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noxcho

Type regedit in the start box. Go to HKEY_LOCAL_MACHINE, SYSTEM, ControlSet001, Services, msahci.
In the NAME panel to the right select start, right click and select modify from the drop down. Under it set the value data to 0. Select OK.
Restart. Go into the BIOS and enable AHCI. When OS boots it should install AHCI driver"
CEHJ

ASKER
Well, you know, the disk seems pretty good anyway, so i might just leave it as ATA after all ;)
Gary Case

Leaving it as ATA is fine -- as I noted above, there's almost no performance difference.    The transfer rate is the same;  the access times are the same;  etc.    The ONLY notable performance benefit of AHCI is the native command queueing ("elevator seeks"), and for a single user system you're not likely to see much benefit from that.     Clearly the other benefit of AHCI -- hot swap capability for the drives -- is irrelevant on a laptop.
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