Slow HD access speed

Access speeds to the D:\* drive are slow- 20-30 seconds to backup small file like Quicken. Saving a renamed MP3 file can take the same amount of time. Over all performance of the system is slowed when the D:\ drive is involved. The D:\ drive is used for storage and backup only - there are no .exe or apps running from that drive. The config is:

AMD AM2 5200 on an ASUS M2N-E motherboard
2 SATA 36GB Raptors in RAID 0 (C:\) which has the OS and programs on it (plenty fast)
1 Maxtor Diamond 10 160 GB IDE drive (D:\)
4GB Corsair PC800 memory
Lite-On SATA DVD R/W
BFG 88640 GTS OC
Using on-board HD SoundMax and onboard ethernet connection
Corsair HX620 power supply
Vista 64 Premium

So, is it the HD config, the motherboard, or Vista? Would changing to a SATA HD for D: solve the problem? There are no updated chipset drivers from ASUS, nor any patches from MS that I can find. If a change in HD is in order, what's the reputation of the WD 320GB SATA2 w/16mb cache?

Thanks,
Fitz
--
Your body is a temple boy,
You ought to treat it well
But you trash the place and rent it out
Like it's some cheap motel - The Badlees
.

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