English – ASRock FM2A55M-DGS User Manual
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ASRock FM2A55M-DGS Motherboard
Installing OS on a HDD Larger Than 2TB in AHCI 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
AHCI Mode in UEFI Setup Utility >
 Advanced > Storage Configuration > SATA Mode. 
3. Choose the item 
“UEFI:xxx“ to boot in UEFI Setup Utility > Boot > Boot Option #1.
(“xxx” is the device which contains your Windows
®
installation files. Normally it is
 an optical drive.) You can also press <F11> to launch boot menu at system POST 
 and choose the item 
“UEFI:xxx“ to boot.
4. Start Windows
®
installation.
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