For individual drives there is no difference between SATA2 and SATA3 disks, at least not performance wise, since there does not exist a single disk that fully utilizes the bandwidth of SATA2, let alone SATA3.
SATA3 disks can have 64 MB cache where SATA2 disks are limited to 32 MB and that can make a difference.
For all conventional disks the performance starts to drop off when you reach a fill-rate of around 60%.
For SATA3 raid disks I would look at Hitachi 7K3000 disks. The alternative WD RE4 is way too expensive IMO and personally I have something against Seagate, having been bitten too many times by their quality.
So this would be a good choice:
http://www.google.com/products/catalog?hl=en&safe=off&gs_upl=1116l1116l0l2662l1l1l0l0l0l0l 224l224l2-1l1l0&bav=on.2,or.r_gc.r_pw.r_cp.&biw=1366&bih=562&q=Hitachi+7K3000&um=1&ie=UTF- 8&tbm=shop&cid=16098708512806944056&sa=X&ei=ooF7TqH5JonViAKQsaHFBw&ved=0CDwQ8wIwAA
So I am really not taking "advantage" of the Sata 3 -- just the 64 MB Cache.
Generally speaking, will that help speeding up export??? OR is Export mainly processor intensive work, rather than the sata "cache" work.
It's wonderful Harm, you are so helpful on these forums. I can get a big "greedy" for your informative responses. Last night I found myself Googling "What time is it in the Netherlands" to see if you were still awake (I'm in California).
That is the one I want to have in my new system, well 16 of them for the new raid.
Export time depends on the format you are exporting. Encoding is CPU intensive, and the gains will be negligent, exporting without encoding like DV to AVI is disk intensive. That is why it is a separate test in the PPBM benchmark.
BTW, I believe the time difference is 9 hours.
I Just put 4 of these in my amazon shopping cart. But before I check out, I just want to make sure these are the same drives from the previous link:
The "0F12115" at the end of the product description made me want to double check with you.
These are the data I have of this disk:
SKU: 0F12115, HDS723020BLA642, EAN: 5704327982289, 5704327985259
but of course these are European or even Dutch numbers.
I ordered the hard drives and also just now ordered the new areca card.
It is weird how I can't find (again) the Answered button. It seems to come and go????