English – ASRock FM2A55M-DGS User Manual
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ASRock FM2A55M-DGS Motherboard
Installing OS on a HDD Larger Than 2TB in RAID Mode
This motherboard is adopting UEFI BIOS that allows Windows
®
OS to be installed
on a large size HDD (>2TB). Please follow below procedure to install the operating 
system. 
1. Please make sure to use
Windows
®
Vista
TM
64-bit (with SP1 or above) or
Windows
®
7 64-bit.
2. Press <F2> or <Delete> at system POST. Set
RAID Mode in UEFI Setup Utility >
 Advanced > Storage Configuration > SATA Mode. 
3. Choose 
onboard RAID 3TB+ unlocker > UEFI Mode For GPT partition. Press
 <F10> to save the change and exit. 
4. Press <F11> to enter Boot Manual. Choose 
UEFI : Built - in EFI Shell.
5. Key in
drvcfg, for example you will see below:
Drv[4E] Ctrl[B5] Lang[eng]
6. Key in
dh [Drv number], for example: key in dh 4E.
English