Downgrade Vista Home Premium to XP x64

baleman2
baleman2 used Ask the Experts™
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I have a Toshiba A305-S6898 laptop running Vista Home Premium 64 bit.  My company is running proprietary software which must run on XP Professional.  To take advantage of the 64 bit OS along with 4 gig Ram memory, I'm installing XP Pro 64 bit on this laptop.  I've downloaded the SATA controller (64 bit version) for the correct Intel chipset.  However, during setup (after pressing F6) I still receive the BSOD.  . . unless I go into the BIOS setting for SATA and change it to compatibility mode.  That allows everything to progress - I'm finishing the installation now.  

However, I'm confused as to what performance to expect in this mode.  Do I need to change back to original settings or will I be okay if the SATA setting remains in compatibility mode from here forward?

If I need to change back to original settings, could you explain this procedure?
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Distinguished Expert 2017
Commented:
You may need to get the AHCI and SATA drivers. You can not change the mode after the install.
You can use nlite from http://www.nliteos.com/ to build the install media with all the hardware drivers as well as all the SP/updates released.
This should let you install with the AHCI mode.

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Commented:
So, if I do not change the mode, do I inhibit system performance?
Running in native SATA mode definitely improves throughput against compatibility mode although this isn't always apparent. Overall, it does make your hard disk more efficient and believe it or not, through native command queueing (NCQ) it can also indirectly reduce wear and tear on the drive and lets face it, anything that reduces wear and tear on a hard drive has gotta be good (%

Once you've installed, the only way that you can feasibly switch to native SATA would be to change the BIOS setting and  do a repair install. I would not recommend this approach though.

My advice would be to confirm with Tosh that you definitely have both the correct and the latest x64 driver for XP. If you're getting a BSOD during setup, it really looks like a driver issue and they will have seen the problem before.

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