Well, consider yourself lucky to get even that.
I have 2 40 gig WD7200RPM drives raided.. The most Ive ever scored in Sandra 2002 is 37,650.
And thats always after a defrag... If I use my PC for a week and retest... My same config gets 22,000... Less than a single nonraided 20gig 7200rpm.
AthlonXP1900+@2100+, Abit KR7A-Raid, Radeon 9700 Pro (core370/mem666), 256Megs PC2100, 2x 40gig WD7200, Soundblaster Audigy Platinum, KDS VS 19" CRT, Klipsch ProMedia 5.1s, Creative 12x DVD, TDK 24x CDRW, 500Watt PSU, Win2kSP3.