120 GB WD = $192
60 GB WD = $118x2 = $236
Factor in the added complexity of putting double the heads on the 120 GB and I am not seeing the price/performance benefit.
On the other hand if you had the second head in there as a backup to the primary, as in it sits there parked until the primary breaks, that might be worthwhile. And the complexity wouldn't be as high since it doesn't have to control both heads at the same time. That might be a good enough level of backup in situations where raid 1 isn't justified.
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