February 9, 201214 yr So i have my cache drive now, a 320 gb 2.5" WD drive. What model drive is this? Blue? Black? if its a 4200/5400RPM Drive then i wouldn't expect you'd see faster speeds. maybe with a 7200rpm drive Even a 5400 rpm drive should get much, much faster speeds than that. When I was using a WD 5400 rpm drive as my cache drive I still got 90MB/s to 100MB/s transfer rates. With a 5900 rpm drive I was getting 95MB/s to 110MB/s transfer rates and a litle faster with a 7200 rpm drive. I ended up putting the 5900 rpm drive and taking out the 7200rpm Hitachi since I prefer to use Seagate or WD drives over Hitachi drives. Any modern 5400 rpm drive with high density platters will easily get over 90MB/s transfer rates. It's a 320GB 5400 RPM 2.5" drive. It does not have the same high density platters being referenced. However in comparison on my laptop I get 50-60MB/s with a 320GB WD scorpio P-ATA drive. On my unRAID server my 3.5" 1TB 5400 RPM WD drives get about 80MB/s read speed
February 11, 201214 yr Author it would also seems that my f4's are only 5400RPM...im sure they were 7200 unless they have moved the goalposts since i bought them. Tell me, how do i know which drives are 'high density' ? does it say so on the tin ?...im not happy that i am getting half the speed of you guys and you have the same-ish RPM
February 11, 201214 yr it would also seems that my f4's are only 5400RPM...im sure they were 7200 unless they have moved the goalposts since i bought them. Tell me, how do i know which drives are 'high density' ? does it say so on the tin ?...im not happy that i am getting half the speed of you guys and you have the same-ish RPM I don't know where the threshold is for high density, but I consider it from 1TB on up.
February 11, 201214 yr it would also seems that my f4's are only 5400RPM...im sure they were 7200 unless they have moved the goalposts since i bought them. Tell me, how do i know which drives are 'high density' ? does it say so on the tin ?...im not happy that i am getting half the speed of you guys and you have the same-ish RPM If I remember correctly, the original F4's were 5400 RPM, then they added 7200 versions and demoted the original 5400 series to "EG F4" or F4EG for EcoGreen The F4's are 4K sector High Density platters that get almost the same performance of 7200 RPM drives of just a few years ago. I use Samsung F4's at both home and work in high end hardware RAID machines because of their speed and high stability. they also seem to run exceptionally cool. so cool in fact, that I think Samsung's output is wrong... I am pretty sure the F4 was when they broke the 500GB per platter barrier and went to a 667GB platter. the F3 2TB drive was a 4x 500GB platter drive with 512k Sectors and did not perform as fast as the 3x 667GB platter w/4K sector F4. The answer for how is high density determined is how much data they get on a single platter. just a few years ago (three'ish) the 320 GB per single platter drive was pretty HD. then they broke that with 667GB... now companies are capable of shoving as much as a full TB per platter with these new 3TB, 4TB and 5TB drives. the deciding factor is how much data is going past the heads in a single rotation. this why you see modern, large 5400RPM (and the 7200 RPM counterparts) drive getting similar (or better) performance then the 10K RPM Velociraptors of just 5 years ago. If you could find a single platter 1TB Drive (I dont even know if they exist), it would be pretty fast. A least the first part of the drive.
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