Feb-Mar 2008
This seems still to be an issue (Feb-Mar 2008 [and still June 2009]) for people downgrading Vista to Windows XP on PCs with SATA drives.
This issue doesn't seem to be consistant accross PC manufacturers, some seem to be "hell bent" on preventing purchasers of Vista equipment to downgrade to WindowsXP.
Some of the methods used to make this more difficult is to disable the system BIOS's ability to handle SATA drives in a "native" manner.
If you are downgrading to XP using a version of XP before wide-spread support for SATA drives was incorporated then you may run into the "No Valid Drives Found" or located by WindowsXP when you boot from the installation CD.
Many solutions for this can be found on the Internet, ranging from downloading a version of your system BIOS that has not been "crippled" to "slipstreaming" your XP installation CD with the recent updates (Service Packs - like SP2) integrated into it.
Below (in green) are some quotes from postings found around the Internet.
Feeling horribly burned here. Yes, I know that downgrading to XP is not supported by HP, but who would have thought that they'd block you from the attempt by giving you a BIOS that won't allow you to do anything? That's the case with my dv6626us just purchased today. I can't disable native Sata.
other comments on this thread (link 1) are interesting
HP adopted a BIOS that does not allow the option of having the hard drive seen by an XP install disk.
If you require access to these links please see here
............works for dv6000 and dv9000, and for dv6700 and dv9700. IT DOES NOT WORK ON dv2700. It works on dv2500 but you have to read some extra posts (quoted below).
The HP BIOS for the dv2500/dv6500/dv9500 series lacks the option to disable SATA Support, so Windows XP will not recognize the harddrive without
.................following the special procedures explained
There is a lot of work here! Even if Robert Viands does think that FCUK is funny! (nogodforme)
If you require access to these links please see here