problem with usbkey

[Adam Antoniak]

Hello folks!
I have a problem with my usbkey. It gets mounted but unmounting is a real
nightmare. Whenever I try running umound command I get message "device
busy". The device has its internal battery that gets charged while
connected to usb port. May that have something to do with it? Looking
forward to receiving some hints helpful in solving this annoying issue.

All the best to all list readers,

Adam