Hello list, I had reported some errors (and addressed some thanks) a while ago about some issues I had with some usb external hard drives. Tonight I had some minutes to spend trying one or two things regarding one of the previous problems that had been solved through an experimental patch. The kernel is a 2.6.11-rc4-bk11 with the following additional patches : http://sjdcolin.free.fr/tmp/Applied/ What is important here is that the patch usb-reset-exp.diff solved some reset problems with the following hard drive :
Vendor: SAMSUNG Model: MP0402H Rev: UC10 Type: Direct-Access ANSI SCSI revision: 02 Which is actually a hard drive enclosed in a lacie mobiledrive. I made some tests with a 2.4.29, to see what happened, and I got (as expected) "-110" errors. So I decided to test a setup I had not tested yet, i.e. putting a usb 2.0 hub between the machine usb plugs and the hard drive plug. The errors consisted in what appeared to be unsolvable scsi transport errors, hence the usb-reset-exp.diff patch. When issuing a command which I knew produced the errors, I got the surprise to see that no usb reset happened when the transfers were made through the hub. I tested it several times, enough so that in the previous configuration it would have made at least an error, and nothing. I unplugged the intermediary hub and plugged the hard drive directly, did the test again, and the usb resets reappeared ! The tests are a simple fsck on the disk partitions, or a big enough read from the disk. The same test on another machine with usb2 did not exhibit any hang or error when doing the fsck. So, this report is mainly food for thought : do you have any idea where the problem could be located, given these new elements ? It sounds like a very precise and narrow hardware problem, but I can't be totally sure, as I'm no expert. Regards, Samuel Colin ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
