Even though we could indeed break the 1TB barrier with a single 3.5in drive I expect Seagate, Hitachi etc to milk the transition. They've cut the platter/heads of their SCSI 15k drives in half so that tells us that they could ship a 500GB or larger SCSI drive if they wanted to using the same tech. It all boils down to cost. Currently we have around 188GB per platter. So adding another platter to the current 750GB drives puts us at 940GB just under a TB.
I don't expect TB drives to hit for another year as they reap the rewards of the 750GB drives.
omgwtfbbq
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