The real question is whether you choose the single 15kRPM drive or additional
drives at 10kRPM... Additional spindles would give a much bigger

And the bonus question.
Expensive fast drives as a RAID for everything, or for the same price many more slower drives (even SATA) so you can put the transaction log, tables, indexes all on separate physical drives ? Like put one very frequently used table on its own disk ?
For the same amount of money which one would be more interesting ?

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