Hi there, On 13 Jun 2003, Pedro Salazar wrote:
> /dev/sdb1: > Timing buffered disk reads: 64 MB in 67.67 seconds =968.46 kB/sec > > hdparm -t /dev/sda1 (USB 2.0) > > /dev/sda1: > Timing buffered disk reads: 64 MB in 13.62 seconds = 4.70 MB/sec > > However this results are very far (specially in the USB 2.0 device) from > the limits announced in the USB: > > USB 2.0 ~ high speed, at 480 Mbit/sec > USB 1.1 ~ low speed at 1.5 Mbit/sec, and full speed at 12 Mbit/sec The 'S' in 'USB' stands for 'Serial'... :) So you are getting around 8Mbit/sec from your /dev/sdb1 and about 40Mbit/sec from your /dev/sda1. You shouldn't expect much more than that from USB1.1 because there will always be a protocol overhead - a lot more bits have to be transferred than just the data. The figure for your sda1 looks at first to be disappointing but at these speeds it might not be the USB subsystem that's slowing things down. 73, Ged. ------------------------------------------------------- This SF.NET email is sponsored by: eBay Great deals on office technology -- on eBay now! Click here: http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
