I run svl7's unlocked BIOS, version A10, on my M17x R4. I ran it for nearly two years with 240GB Mushkin SSD SATAIII in 1st HDD bay, and stock Dell 750GB HDD SATAII in 2nd bay. It worked without issue. Recently I replaced the 750 with a 1TB HDD with a SATAIII interface and I see the laptop bluescreening when accessing both drives simultaneously (i.e. copying files from one drive to the other.) I remember there was an issue with these mobo's where there was instability when both drives were in SATAIII mode so Dell limited the 2nd bay to SATAII in BIOS A05 or A08 I think. However it looks like that restriction was dropped in the unlocked BIOS I'm using and HwINFO confirms that both drives are operating at SATAIII. Assuming I DO NOT want to drop down to the stock BIOS, is there a way I can limit the 2nd drive to SATAII, or do I have to shell out the $$ for a similar 1TB drive with a SATAII interface? Thanks guys.