Trouble unmounting USB devices

Rick Chen rick.chen at
Fri Mar 11 04:29:43 UTC 2005

On Thu, Mar 10, 2005 at 09:19:51PM -0700, Kevin Kempter wrote:
> Hi all;
> I have 2 devices that I use often.
> 1. a 1Gig memory stick via a usb emory stick reader
> 2. a 40Gig Firelight USB2 exterenal hard drive
> both devices are immediately recognized and have no problems with usage. 
> However much of the time I cannot unmount the device. I get a message 
> that says the device is busy. I have no windows open which are "in" the 
> device directory.
umount with lazy option some time get rid of this problem.
umount -l /media/usbdisk

to list all open file for a device
/usr/sbin/lsof /media/usbdisk

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