SATA setting in BIOS keeps changing on its own! Any thoughts as to why or how??

Weird- A while back I awoke to the BSOD on my HP Pavilion desktop running Vista Home Premium. I eventually found that it was a result of the SATA setting in BIOS was set to RAID, (which it shouldn't be since I do not have a dual drive set up). I reset the SATA setting back to ACHI and its been fine since. I wondered if was a result of a windows automatic update, (computer set to update at 3am), thus i found it when I got up in the morning, or something strange like that. It just happened again a cpl days ago. I went back into the SATA setting to find it was once again on RAID. So now I'm really thinking it has to do with an auto update, but I can't find any talk about that occuring.

Any thoughts on what is causing this to happen??

I'd appreciate any info.



Knows where his towel is.
Staff member
How old is the PC ? More specifically, how old is the CMOS battery ?
Has the PC also lost track of the date/time ?
The BIOS settings are maintained by that 3v CR2032 battery on the mobo.
Hi Terry, thanks for responding.

The PC is about 5 yrs old now, but actually the Mobo is just a couple months old, it was just recently replaced. I had a harddrive quit working and the cpu was still under warranty so when it was in to replace the HD, they determined the mobo was also bad.

So I don't seem to be having any other noticeable issues. No date/time issues.


Mostly Harmless
Staff member
Visser, I've seen weird motherboard behavior when a new USB device is connected or disconnected when the machine is turned on or rebooted.

I would look for a BIOS update.
Thanks for the reply Computer Guru. I wouldn't have thought about anything like that. Makes sense that it could have been something like that. I'll check. Thanks.