Asus's site gives this specs for storage controllers. So you might want to go to Asus support site and download drivers for those chipsets.
Quote:
ULi M1575 South Bridge:
- 2 x UltraDMA 133/100/66/33
- 4 x Serial ATA I/II 3.0Gb/s with RAID 0, 1, 0+1, 5 and JBOD support
Silicon Image® 3132 SATA controller supports
- 1 x Internal Serial ATA 3 Gb/s hard disk
- 1 x External Serial ATA hard disk (SATA On-the-Go)
- Support RAID 0, 1
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Since I can't figure out what else might be wrong. 32-bit storage is generally not used since there is 48-bit option that allows drives bigger than 137Gb.