USB is autodetecting but when its pull out throwing error
 

Friends,

OS: RHEL AS 3.0

when i insert my usb its detecting automatically in /dev/sda1.
after that i mount by /dev/sda1 /mnt/flash.
no problem in mounting.....
after finish my work...i umount /dev/sda1 /mnt/flash
it says /dev/sda1 not mounted.
when i unplug the usb device its throwing an IO error...
what might be the reason?

thanks
sathyguy

Umount the mountpoint, not the device: "umount /mnt/flash"?

i tried both.....separately.
umount /mnt/flash
umount /dev/sda1 /mnt/flash

umounting is not a problem.its working fine..
but when i unplug/remove the usb im getting an io error....that is the problem.

What exact error? What happens if you try to unload the corresponding kernel modules?

ok....

as soon as i insert the usb....im getting the below message.
after this i have to press the enter key then only the prompt will display.

i.e., [root@mypc root]$

now i will mount the usb to the mount point /mnt/flash
[root@mypc root]$ mount /dev/sda1 /mnt/flash
[root@mypc root]$
ok...now its mounted.....
now im umouting.....
[root@mypc root]$ umount /mnt/flash
[root@mypc root]$
ok....its umounted....

now im removing the usb....(below is the error im getting)

after this i have to press the enter key then only the prompt will display.

i.e., [root@mypc root]$

thanks
sathyguy