Alejandro Salas wrote:
My question is that I can mount-unmount the device
perfectly, but in windows I notice that when I unmount
it the light from the pen drive goes off... and when
I unmount it under linux the light stays on. A friend
told me that I should unmount it using eject, that the
light not going off is not a good thing, but nothing
changes. I don't know if it has to do with the fact
that my pen drive seems to be different ( having to
mount it on another device ), or what.
The main reason for unmounting before unplugging is to make sure there
isn't any data transfer occurring when you unplug the device, as this
could cause permanent damage.
However, unmounting from the filesystem is not the same as removing the
pen drive as a device. When you unmount the device, while it no longer
appears in your filesystem, it still remains recognised by your PC as a
device, it will still have a device assigned for it in /dev, it will
still be drawing power, etc. This is a distinction that is less clear in
Windows, which unmounts and unplugs a device simultaneously (even if
that's not what you *want* it to do...)
I'm guessing that's why the light is still appearing. If the drive is
unmounted then you should be able to unplug it without any risk, but if
you want to be certain then you can always use "eject /dev/sda" (run as
root or using sudo) which should then mean the light comes off.
(NB eject using "/dev/sda" because /dev/sda is the device itself, and
/dev/sda1 is the partition on the device which stores the files.)
I have the same issue with my iPod, which keeps the "Do not disconnect"
message up even after it's been unmounted from the filesystem, and if I
just unplug it there are no problems.
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