J.S.Sahambi wrote: Here is the relevent output of usbview: ************ USB UHCI Root Hub Serial Number: b400 Speed: 12Mb/s (full) Number of Ports: 2 Bandwidth allocated: 0 / 900 (0%) Total number of interrupt requests: 0 Total number of isochronous requests: 0 USB Version: 1.00 Device Class: 09(hub ) Device Subclass: 00 Device Protocol: 00 Maximum Default Endpoint Size: 8 Number of Configurations: 1 ************ *********************** Portable Hard Drive Manufacturer: Iomega Serial Number: 59B710010D9A0000 Speed: 12Mb/s (full) USB Version: 2.00 Device Class: 00(>ifc ) Device Subclass: 00 Device Protocol: 00 Maximum Default Endpoint Size: 64 Number of Configurations: 1 Vendor Id: 059b Product Id: 0071 Revision Number: 11.00 *********************** The outpof of lsmod is given below: Module Size Used by Not tainted usb-uhci 20676 0 (unused) usb-storage 97120 0 (unused) nls_iso8859-1 2880 0 (autoclean) mga 102768 1 ide-scsi 7456 0 agpgart 29792 3 parport_pc 25672 1 (autoclean) lp 6880 0 (autoclean) parport 21696 1 (autoclean) [parport_pc lp] nls_cp437 4384 4 (autoclean) apm 9116 1 cmpci 26008 0 soundcore 3204 2 [cmpci] keybdev 1664 0 (unused) usbkbd 2848 0 (unused) input 3040 0 [keybdev usbkbd] usbcore 48000 1 [usb-uhci usb-storage usbkbd] The hub is showing USB 1.0 and the drive is showing usb version 2.0. So is HUB the culprit running at usb VERSION 1.0? If so, how do I enable the 2.0 version of usb hub? Thanks J S Sahambi
Monique Y. Herman wrote:On Fri, 21 Nov 2003 at 10:23 GMT, J.S.Sahambi penned:I have a Iomega 20 GB usb hdd. It gives good data transfer rate when used with windows. But when I use it with linux, the data transfer rate is low, in the order of 500 Kbytes/sec. Is there any way to increase the data transfer rate? Thanks J S SahambiWithout actually thinking through the numbers, my first guess would be that it's a usb 2.0 device, and you only have usb 1.1 enabled in your kernel. Does that seem possible? You might install the usbview package and see what it says about transfer speeds.
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Dr. J. S. Sahambi
Assistant Professor,
Dept. of Electronics & Communication Engg.
Indian Institute of Technology Guwahati,
Guwahati 781039, Assam, INDIA.
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