Hard Drive data rates

[Aaron Konstam]

> >
> > I use a Seagate 320 gig ES SATA drive. This is a 3 Gb/sec drive BUT - it was 
> > shipped with a jumper installed limiting it to half that rate, and this rate 
> > is in any case a very optimistic one. Using hdparm as suggested consistently 
> > gives me 78 MB/sec. That seems to be as good as it gets. Also this is a very 
> > artificial figure, I have an old (about ten years) 9 gig SCSI drive that does 
> > about half that. It seems that the recent addition of NCQ to SATA drives 
> > makes more of an improvement in heavily loaded scenarios but quantifying this 
> > is not simple or unambiguous. I want to try reconfiguring this setup in raid 
> > 0 but won't be able to do so for a while. I know that another recent Seagate 
> > drive, their 400G ATA gives transfer rates using hdparm -tT of about 50 
> > MB/sec.
> >
> >   
> There appears to be something wrong with hdparm on my computer. It only 
> does this with all the various -tT and such:
> 
> [root at k5di /]# hdparm -iItT
> 
> hdparm - get/set hard disk parameters - version v6.9
> 
> Usage:  hdparm  [options] [device] ..
try: hdparm -t /dev/sdax and hdparm -T /dev/sdax
where x is a or b, etc.

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Whoever dies with the most toys wins.
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net