On Thu, 1 Dec 2005, Andrew Lees wrote: > The maximum transfer rate in reading/writing ide disks connected via usb > 2.0 seems to be 12MByte/sec. I would have expected 30-40MByte/sec. The > rate is more or less the same with a 2.5" 60G drive and a 3.5" > 160G/7200rpm drive (using different enclosures, although both genesys > chips). Is there some magic I am missing? I get around the same rate > with ext3 and reiserfs (options notail,noatime). The 160G disk is > capable of 50+MByte/s transfer rates. > > These values are much the same for my laptop (1.5G Pentium-m + Mandriva > 2.6.12-12mdkcustom) and desktop (AMD64 2800 + gentoo 2.6.14-gentoo-r2, > also 2.6.13....)
> Any suggestions? Thanks in advance This speed is largely determined by the USB interface chip in the enclosure. I don't think there's much you can do to improve it (other than getting a different enclosure), although you can make transfers a lot _slower_ by mounting with -o sync. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
