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I installed an Adaptec 2400A RAID card connect to four 250GB ATA drives last week. Fedora Core 1 detected it fine and installed fine. However I noticed slower performance in an app I normally run. I ran hdparm and got the following results. I'm using 2199 kernel.
BTW, the system also includes two S-ATA drives connected to the mobo. /boot is mounted on one of them (sdb1), swap the other. The rest is given to a software RAID partition where I mounted / (md0). The Hardware RAID partition is /dev/sda1 below where /home is mounted.