On Thu, Oct 21, 2010 at 7:33 AM, Polytropon <free...@edvax.de> wrote: > On Wed, 20 Oct 2010 14:54:21 -0700, David Brodbeck <g...@gull.us> wrote: >> Fortunately, USB mass storage devices are highly standardized. One of >> the things they got right. > > Highly, but not fully. In some cases, manufacturers "know better" > and produce memory sticks that don't work on FreeBSD as they do > require some "driver" (no idea what is meant) to be accessible. > They seem to vialote the standards for USB direct access, so the > system gets into trouble (because it has to work with an obviously > defective storage media). > > Here's an example of a stick I returned to the shop the same day, > said "It's broken, money back." with a dmesg + fdisk printout on > tractor paper (always looks impressive). :-) > > umass0: <SanDisk Cruzer Micro, class 0/0, rev 2.00/2.00, addr 2> on uhub2 > da0 at umass-sim0 bus 0 target 0 lun 0 > da0: <SanDisk Cruzer Micro 8.02> Removable Direct Access SCSI-0 device > da0: 40.000MB/s transfers > da0: Attempt to query device size failed: UNIT ATTENTION, Medium not present > umass0: at uhub2 port 2 (addr 2) disconnected > (da0:umass-sim0:0:0:0): lost device > (da0:umass-sim0:0:0:0): removing device entry > umass0: detached > > I couldn't not format it (it was some FAT format on it) as it > detached from the system by itself as soon as accessed. > > I had such a Usb stick, Went to get u3 removal tool and then removed it and the usb becomes good again :)
Those Cruzer Mini's with the U3 software give lots of trouble. First remove the U3 crap from them and then they should work well :) > >> Now, the USB keyboard protocol...ugh, they really dropped the ball on >> that one. It's standardized, which is good, but it's a polling >> interface and tends to occasionally lose events under high CPU load, >> which is bad. Especially if it's a key-up event that gets lost. > > USB mice suffer from the same problem - the polling. In the past, > I never had problems with interrupt-driven (serial and PS/2) > equipment, even on lowest-end (!) hardware. Today, some load can > render the system nearly inresponsive for several seconds (no > keyboard input, mouse stopped). > > This is true. I had some problems making a usb mouse work, but I had to manually plug it in to different usb slots till it worked from the start. The keyboard(usb) sometimes takes a while longer to respond than the PS2 one, but as long as I can get some work done. Regards, Antonio > > -- > Polytropon > Magdeburg, Germany > Happy FreeBSD user since 4.0 > Andra moi ennepe, Mousa, ... > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org" > _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"