05-24-2016, 12:46 PM
The rotational speed is invariable; but the precise speed is trade secret and rumour is slightly different between models - generally estimated to be between 5400 and 5900 based on performance testing. I suspect 'intellipower' refers more to shutting down (stop spinning) when idle.
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Performance between 5400 and 7200 for a contiguous large object is measurable but unless you time it you might not notice the difference and for general work load (lots of small objects) it is noticeable but again not night and day. I myself use an array of 4+2 7200 rpm drive and writing/reading a large object off of four disks in parallel is very noticeable (compare to a single green drive) but prior to building the array I had one segate green drive (i forget if it was 5400 or 5900) and one non-green drive and there is some difference but not night and day. In practice measuring these things is tricky since outside track performance greater variance (compared to inside track) than 5400 vs 7200 (i.e, 5400 on the outside track can be faster than 7200rpm drive on the inside track). Again these comments are for contiguous large object. If the object is small or fragmented then disregard these comments.
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Performance between 5400 and 7200 for a contiguous large object is measurable but unless you time it you might not notice the difference and for general work load (lots of small objects) it is noticeable but again not night and day. I myself use an array of 4+2 7200 rpm drive and writing/reading a large object off of four disks in parallel is very noticeable (compare to a single green drive) but prior to building the array I had one segate green drive (i forget if it was 5400 or 5900) and one non-green drive and there is some difference but not night and day. In practice measuring these things is tricky since outside track performance greater variance (compared to inside track) than 5400 vs 7200 (i.e, 5400 on the outside track can be faster than 7200rpm drive on the inside track). Again these comments are for contiguous large object. If the object is small or fragmented then disregard these comments.
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