Hi there, I am having this same issue with my HP N54L microserver. I have been running DSM 4.2 build 3202 for around a month with the included 250gb HD in SATA port 0. Recently I upgraded the bios to the hacked one to enable SATA port 4 and port 5 AHCI (which i need to enable in the BIOS menu), and put my HD on SATA port 5. Since then, I have discovered that DSM will write to the BIOS and lose all settings, reverting back to the default settings which disables AHCI on port 4 and 5 and therefore my server does not boot! I am not knowledgeable enough to know how to fix this, can anyone advise on a solution?
At the moment I have put the official HP bios back on the machine, and put my hard drive back into port 0 and everything works fine, but I would like to make use of the extra SATA port in the future.
Thanks