My newly bought hdd-s seem to have lower than expected rw-speed
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I sort of expected more. Since it is supposed to be a 10k rpm harddisk. HDDs in my 5yo comp have about the same speed - and they were the cheapest I could get at the time.
Originally Posted by tredegar
If it "works fine" then what is your problem?
They work, sure. But I have spent quite a lot money on that Raptor, and I would rather like that it runs to the max of its capacity. Otherwise I could just have bought another Caviar with 6 times more storage space and almost the same read speed.
Originally Posted by tredegar
Why have you posted your code in such a tiny font? It's impossible to read. The LQ defaults are fine, and preferable.
Fixed. But you did manage to read the "udma6*", right? So I guess it's not *that* bad. And besides, maybe your browser font size settings need adjustmest - I for one am able read those font=1 lines fine.
Originally Posted by amani
Are the Sata settings ok: jumpers, AHCI ?
Well, I tried setting jumpers to OPT1 mode, which is supposed to allow 150MB/s transfer rates. But that didn't do much at all. While AHCI is another story. I had to disable it to achieve at least decent speeds. With AHCI on, I would get something like 25mb/s (both when trying the hdparm test and a manual "dd if=/dev/sda of=/dev/null"), but the result would fluctuate much: one second it could be 50mb/s and if you tested it again right afterwards it could be down at 15mb/s.
The increased spindle speed of the Raptor isn't so much about delivering greater transfer rates as it is in focusing on markedly lower seek times.
If you want extreme transfer rates, put two drives in a striped (RAID 0) config... of course, then there's no redundancy, so there is a tradeoff.
85 MB/s is nothing to sneeze at, performance-wise. Sure, it's not a full 133 MB/s as the UDMA6 spec provides, but you'll be hard pressed to find any drive out there that can run that speed in a standalone configuration (that doesn't require NASA's budget).
Sorry the Raptor isn't exactly what you expected. For what it's worth, I think they're great drives, and use them myself. But if you want the most performance, you'll need to set up some kind of RAID config with at least two of the puppies.