Da det er mange diskoperationer du laver vil jeg klart foreslå raid, enten 0+1 eller 5 alt efter hvad bundkortet understøtter og det ser ud til det er RAID 5 det understøtter. Så skal du have 3 identiske diske.
Lidt om RAID 5
RAID 5: Striped Set (3 disk minimum) with Distributed Parity. Distributed parity requires all but one drive to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive.
fra
http://en.wikipedia.org/wiki/RAIDMed et RAID setup skulle du gerne komme op over de 100 mb/s i sustained transfer rate