SCSI Quantum hard disk not usable?

[sam wun]

Hi,

I tried to use SCSI Adaptec 29320 and 29162 with two SCSI Quantum hard 
disks for installing FreeBSD 5.3 stable, the first time was fine, I 
insalled freebsd 5.3 on one of the hard disk without any error. Then 
error start coming when I reinstall the system. Both hard disks start to 
pring tons of errors on the screen until the system is freeze and 
reboot. Is this because my two SCSI hard disks become unusable? It was 
very expensive.

Sam.