Suggestions for a intensive disk utilitiy for windows 2003 server?

I have an old dual pentium 3 600mhz server that was being tossed so i acquired it. Anyway, I also got a nifty sca hotswap scsi raid backplane from another server and decided that i will use that for my file/web/active directory server at home (i want to learn server stuff).

Anyway, win2k3 server (standard) is running great. I put it on a 9 gig ultrawide narrow scsi drive (not an sca hotswap drive). It is connected to the 1st scsi bus on the motherboard. I then hooked up the hotswap backplane to the other scsi bus on the motehrboard. I then stuck 4 drives into the backplane. 2 18 gig, 1 9 gig, and 1 35 gig. I then made all 4 of the disks dynamic and then made the 35 gig drive its own separate partation but i spanned the 3 smaller drives as one large 44 gig drive. So i have one partation E that is made up of the 2 18 gig and the 1 9 gig drive.

I then went ahead and started copying a bunch of stuff from my old server to the spanned drive (i didn't want toput anything critcial on the spanned array since i know that if one of the drives dies in the span, it kills the whole spanned array.)

It then started giving me errors after a while saying "write delay failed". Disk managment ended up showing the drive as unhealthy and failed. I then blew out the span and made each of the drives their own partiton. I ran the throuogh scandisk on the 3 drives (the 2 18s and the 1 9 gig). The scandisks were perfect.

I then blew out the 3 partiions and rebuilt the spanned array. I'm now just copying as much stuff as I can to that array just wondering if i can get it to crash again but what I would really like is a recommendation on a intensive disk testing program that will work under win2k3 server that wiil flog these drives hard.

I would strongly perfer a freeware/shareware program that would do the job if there is one available.