On Sat, 2 Mar 2013, Clemens Ladisch wrote: > Alan Stern wrote: > > Then plug in an ordinary USB flash drive and run the attached > > program (as root), giving it the device path for the flash > > drive as the single command-line argument. For example: > > > > sudo ./ehci-test /dev/bus/usb/002/003 > > > > The program won't do anything bad to the flash drive; > > All my flash drives beg to differ. > > Transcend JetFlash: > > ./ehci-test /dev/bus/usb/001/007 > URB timed out; bug may be present > URB timed out; bug may be present > URB timed out; bug may be present > URB timed out; bug may be present > ^C > ./ehci-test /dev/bus/usb/001/007 > Unable to send TEST UNIT READY: Broken pipe > ./ehci-test /dev/bus/usb/001/007 > Unable to send TEST UNIT READY: Broken pipe This is normal. You didn't unplug the flash drive between tests. The test program leaves the drive in an intermediate state; it has to be reset before it will work again. Unplugging it is the easiest way to reset it. > Nexus S: > > ./ehci-test /dev/bus/usb/002/006 > TEST UNIT READY status 1 That's odd. Perhaps the Nexus S doesn't initialize the flash drive when it is plugged in. Normally this initialization happens when usb-storage binds to the flash drive, but maybe the Nexus S doesn't have usb-storage. > ./ehci-test /dev/bus/usb/002/006 > URB timed out; bug may be present > URB timed out; bug may be present > URB timed out; bug may be present > URB timed out; bug may be present > ^C > ./ehci-test /dev/bus/usb/002/006 > TEST UNIT READY status 2 > ./ehci-test /dev/bus/usb/002/006 > URB timed out; bug may be present > URB timed out; bug may be present > URB timed out; bug may be present > ^C Once again you didn't unplug the flash drive between tests. > some Genesys card reader: On what system? The Nexus S? > ./ehci-test /dev/bus/usb/001/010 > TEST UNIT READY status 1 > ./ehci-test /dev/bus/usb/001/010 > TEST UNIT READY status 1 > > (and, of course, nothing in the log) I stand by my original statement. If you unplug the flash drive after a test and then plug it back in, you will find it back in its original condition. No harm done and no data erased. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
