I spent some good money hoping to see 190MB/sec avg read. But unfortunately after installing Four Serial WD400JD's drives I only get 74MB/ sec which almost the same as when I had Two ATA/100 drives in RAID.. Very dismayed. Could anyone explain this to me please why it's so slow? I googled about using 4 serial drives in RAID before I bought these and the results I saw were very promising.. Thanks for any input.