On Tue, 28 Jun 2005, Chris Friesen wrote: > PROBLEM: flaky access to compact flash cards > > SYMPTOMS: when reading card under either of two different USB2 card > readers, get intermittent scsi errors. Card reads fine under USB1.1 reader. > > KERNEL: 2.6.12.1 > > DETAILS: > > I've been using lexar cards with the jumpshot reader for some time. > Recently I picked up another card that didn't work with the jumpshot. > > My machine doesn't do USB2 so I picked up a USB2.0 pci card (ALi-based). > I was having various compatibility issues until I upgraded to 2.6.12.1. > > I have two card readers, one is a cheap oriental one, the other is a > Verbatim. Both claim USB2 hi-speed. Both have worked. > > Recently I tried reading a card full of pictures. It got part-way > through then gave me an I/O error. "dmesg" gave a bunch of logs like:
> I switch card readers, and got similar behaviour--it read some of the > files, then gave the following: > Finally, I put the card in my old Jumpshot reader, and it read perfectly > with no errors/warnings, and the files (jpegs) do not appear damaged > when viewed. > > > Anyone have any ideas what's going on? Just as a guess, it looks like your new USB-2.0 card doesn't work very well. Lots of people have reported similar sorts of strange things with ALi-based hardware. Rumor has it that the NEC chipsets are very reliable. The best way to isolate a single faulty component is by swapping hardware and trying out the different combinations. For example, you might try plugging your readers into another computer with a different kind of USB 2.0 controller. You might try moving your PCI USB card into another computer and see if it still fails to communicate with the readers. Alan Stern ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
