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My point was more than iSeries disks can be used elsewhere if no longer needed in the iSeries. I do believe they do some form of firmware optimization to gear them more towards seeks performance vs. sustained transfer rate, but that doesn't impact their ability to be used outside of an iSeries chassis. As to using non-IBM disk, the essence is that it needs to tell the iSeries a valid model number and it needs the right kitting to physically mount. No off the shelf disks do this. Yes, IBM DASD is still overpriced. But it is coming down. I dropped 5TB (usable) of RAID5 disk in our DR system (42 140GB 15K disks + 2780s + 0595s) for well under $150K. For the performance and capacity I don't really consider that a bad deal at all. Sure I could buy 5 Buffalo TeraStations for 5 grand, but they wouldn't provide near the performance and iNtegration that iSeries disk provides.
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