On Mon, 5 Apr 2004, Peter Santoro wrote:

> Below are the results of running my first test (boot PC, login as root, 
> insert lexar jumpdrive, attempt to mount the vfat formatted device). 
> When I ran the test on my IBM PC300PL 6862-U8U (500Mhz P3), the mount 
> command hung for ~30 sec and then the system crashed.  When I ran the 
> test on my home-grown ASUS P3BF system (1400Mhz celeron), the mount 
> command hung for ~30sec and then completed ok.  Subsequent mounts on the 
> ASUS system were quick.  Both systems are running slackware 9.1 with 
> updates and kernel 2.4.25.  The IBM is using hotplug 2004_01_05 and the 
> ASUS is using hotplug 2003_08_05.  Also note that I tried this test on 
> another IBM PC300PL (different model #, slackware 9.1, kernel 2.4.23, 
> hotplug 2003_08_05) and had a similar crash.  Also note that using a 
> CompUSA 256MB thumb drive works fine in all these PCs and always mounts 
> quickly.  Maybe there's a hardware (memory?) problem with these IBM 
> PC300PL machines.  The information below is from the IBM PC300PL 6862-U8U:

It looks like the device got sufficiently confused that it disconnected 
itself from the USB bus.

Try turning on usb-storage debugging in the kernel configuration.  That 
will add lots of debugging information to the system log, showing exactly 
what is happening during the failed mount attempts.

Alan Stern



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