Aaron Konstam wrote:
On Fri, 2007-09-28 at 12:07 -0700, John Wendel wrote:
Lamar Owen wrote:
On Friday 28 September 2007, Karl Larsen wrote:
I was lead to mis-understand the data rate of my new SATA hard
drive. It indicated that the data rate was 3 GB/sec. But some checking
with Google said the Hard Drive makers are very free with their units.
To be specific a SATA drive is 3000 MegaBits/second. This boils down to
about 375 MB.
Due to the 8B/10B coding used in SATA, you can divide the bitrate by ten and
not eight to get the byterate. Thus, 3Gb/s is 300MB/s at the wire. The
semi-standard way of differentiating between bits per second and bytes per
second in specs is to use a lower-case b for bits, and an upper-case B for
bytes, but unfortunately not everyone follows that.
Your talking about the wire speed. The REAL speed is determined by the
disk drive. You're lucky to get 75MB/s with a desktop drive.
Regards,
John
Try hdparm -T and hdparm -t
These just list what the file hdparm can do in very brief terms. And #
hdparm is not working at all well on my F7.
--
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It is much easier to suggest solutions when you know nothing about the
problem.
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx
--
Karl F. Larsen, AKA K5DI
Linux User
#450462 http://counter.li.org.
