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| p.1 #6 · Anyone Have Two Hard Drives in Their iMac? |
All things being equal - that is the drives are exactly the same: model, rotation speed, cache, etc. - hard drive thru put speeds in descending order are:
There are other variables like how fragmented and how full a drive is that can effect read/write times, but in general the above list holds true. Given the expense of SSD drives, it makes the best sense to use them as boot/application drives rather than for data.
Thunderbolt and USB 3.0 promise remarkable thru put but I'm unaware of any real world demonstrations of their superiority. The exception to the above list involves data warehouses and server farms with the need to deliver huge quantities of data in real time. They use extremely advanced (read mind-bending expensive) RAID and interconnect systems. You don't even want to think about such systems.
I have 4 internal and 2 external drives in my MacPro. The externals are eSATA and serve as backup devices with one of them dedicated to my photo library. I use a pair of Fujitsu 750GB 7200 RPM, 64MB cache drives as my internal work drives. They store only the photo library. All programs live on the boot drive. I periodically (after backup) copy the current library over the older version. This gives me (1) a fall back copy of my library that while not up to date would survive the other drive's failure and (2) such a large copy operation gives about 85% of the efficacy of a complete reformat in terms of defragmenting the drive and giving quicker drive read/write times. I've never timed how long it takes my now ~300GB library to copy from one drive to the other, but lets just say I go have a cup of coffee while it is going on.