You really notice it transferring that fast? Or is just the output of the hdparm program?
Because if its not ultra-fast maybe you'll come to Richard's answer again: 1024Megabits / 8bits = 128Megabytes That meaning the transfer rate is limited to less than the actual bus... Dunno, maybe that could explain, but I'm sure someone here has a more technical explanation. On 6/9/05, Colin <[EMAIL PROTECTED]> wrote: > Richard Fish wrote: > > >Alec Shaner wrote: > > > > > >>I recently purchased a WD 160GB external USB drive and can't get it to > >>perform reliably on my server. It works fine when connected to my > >>workstation machine (a P4P800 ASUS MB with USB 2.0 support). The server > >>only has 1.1 USB support, but the problem is that it starts out copying > >>fine at about 11MB/sec and then after a bit slows to a crawl and stays > >>that way. I have formatted it with an ext3 filesystem. Here's all the > >>info if anyone has an idea. > >> > > > >With USB 1.1 you are not going to get more than about 1.2MB/s > >throughput, because the top speed is 11 megabits/sec, not megabytes: > > > >11 mbit / 8 bits-per-pyte = 1.375. > > > >The initial burst you see at 11MB/sec is likely due to buffering. > > > Maybe you can answer this question. I have an ATA/66 parallel ATA hard > drive (66 MBps) on an ATA/133 bus. If the bus is limited to 133 MBps > and the drive cannot transfer data at more than 66 MBps, how come burst > transfers (as reported by hdparm -tT /dev/hdg) are at about 1.6 GBps? > > Not that I'm complaining, of course, it just seems illogical :-) > > -- > Colin > > -- > gentoo-user@gentoo.org mailing list > > -- Daniel da Veiga Computer Operator - RS - Brazil -- gentoo-user@gentoo.org mailing list
