Lógico ¿no? Si ya estabas en Achi no era necesario modificar la Bios.
Lo de modificar la Bios antes de instalar el S.O. es para el que tiene los Satas en Ide, tal y como pone en las instrucciones del parcheo de la Bios:
Modifying the BIOS
Starting from the MAIN screen shown in Figure 8 above and using information I had found at Message #1217 and NAS Build Guide I moved through a number of screens to set Ports 4 & 5 to use AHCI and set all Ports to be external SATA Ports (basically enable hot swap).
From the MAIN Screen I went to => Chipset Menu => Southbridge Configuration => SB SATA Configuration => and set the following:
OnChip SATA Channel [Enabled]
OnChip IDE Type [IDE or Legacy IDE](1)
SATA IDE Combined Mode [Disabled] — sets Ports 4 & 5 to use AHCI
SATA EPS on all PORT [Enabled](2) — sets all Ports to be external SATA Ports
SATA Power on all PORT [Enabled]
Notes: (1) OnChip IDE Type can be set to IDE or Legacy IDE – I have one MicroServer (WHS-2011) set to IDE (see Figure 9) and the other (S2012E) set to Legacy IDE (see Figure 10) and haven’t noticed a performance difference between the two, YMMV; (2) setting all Ports to be external SATA Ports will make all of your Ports to be Hot Swappable – this is something you would need later if you want to use the Port Multiplier functionality of the eSATA Port (Port #4) – there are registry hacks that will remove the hot swap functionality from specific Ports but I didn’t bother, again YMMV. A link to the steps outlined by Alex to enable the Port Multiplier on the eSATA port can be found in Useful MicroServer links and References that highlights the necessary posts to read in the thread Successfully enabled Port Multiplier on eSATA. Depending on your planned setup you may not want to Disable SATA IDE Combined Mode – LoneWolf found that disabling SATA IDE Combined Mode also disable the ability for the MicroServer to see his HP Smart Array P410 Hardware RAID controller. YMMV.http://homeservershow.com/hp-proliant-n40l-microserver-build-and-bios-modification-revisited.html