Delay in unmounting a USB pen drive

[Raj]

SuSE kernel 2.6.5:

My USB pen drive has a vfat FS. When i transfer some files & try to
unmount the drive ( umount /mnt ) , the command appears hung. CTRL+C also
does not work. Only later did i realise that it was actually taking a
longer time ( 10 - 15 sec )
to unmount.

My questions are:
- Why is it taking a long time to unmount ?
- Is it safe to remove the pen drive from it's slot when the umount is still in
  progress ?? ( I tried this the first time & maybe lucky me, the
files copied were fine )

TIA
-- 
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raj
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