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I can mount and umount and mount again my usb pendrive
I can mount and umount and mount again my usb hard drive
I can mount and umount and mount again my usb MP3 player
What I cannot do is mount one of them, umount them, then unplug it and plug in and mount one of the others. Once I have mounted one of them the only one that it will accept is the same device, unless I reboot.
This problem occurs whether root or user with
mount -t vfat /dev/sda1 /mnt/flash
I have this same problem on my RedHat 7.3 box, only I get no medium found instead of bad blocks. I found a workaround, but figure that the problem will go away when I have time to install a semi-recent distro on this machine.
My solution is:
<umount old drive, disconnect>
modprobe -r usb-storage
<wait ~5-10 seconds>
<plug in new device>