Things may have changed, but real world comparisons of PATA and SATA drives often ended up with neglible differences. The differences if any now would stem from SATA drives benefitiing from increased development and 'bells and wistles' such as increased cache sizes etc. It's also easier to set up arrays of disks under SATA due to the proliferation of connections.
I may hoever be off the mark drives are taking advantage of the increased bandwidtgh avialble. Otherwise I'd say the RAID array would be quicker assuming the PATA and SATA drives were comparable.
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