> However, if one adds a black box containing bunch of drives, a CPU and > cache management software, well it's not really a disk drive any more, > even of the host sees it as one. More fundamentally - we've gone from 20MB capacity, 25ms seek time, 280Kbyte/second to 500GB capacity, 14mS seek time, 60MB/second + The cost of seeks has gone through the roof in proportion - in fact it gets ever more tape like. Alan