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 -- ======================================================================= It is much easier to suggest solutions when you know nothing about the problem. ======================================================================= Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx
