This supposed to sound easy. But I am having problem getting out of this quagmire. I was able to mount a handy drive at sda1 to /dev/hd and successfully read its content. I had not open any of its files.

I wanted to unplug it out of its usb port, but I was having problem unmounting it.

I tried
#umount /mnt/hd
as well as
#umount /dev/sda1
but keep getting
device is busy
reply

I even tried to umount -f but to no avail.

I have checked and has not found any open file or

man umount did mentioned busy devices but there was no valuable tips which I can apply here. Only that if I remove it without unplugging I might corrupt its file system. Please note that my usb handy drive is in FAT16 (VFAT)

Thanks

How about:

# cd
# umount /dev/sda1

Just do a "mount" and see what it's actually mounted as? :}

Cheers,
Tink ....

If this is a USB device you should install 'hotplug' to handle the modules, you might be getting the error because of a kernel module, to check try the rmmod command on the module used by the device and then the umount command.

Maybe you could check file usage using "fuser".
If opened by a process it'll return the pid.