When copying a le to a USB ash drive on a Unix system it is

When copying a le to a USB ash drive on a Unix system it is extremely important to unmount the ash drive before removing the device. If the USB ash drive is removed before unmounting then the copied le will normally appear on the ash drive’s le system (have a directory entry and an inode) but will be empty. Explain what is happening here : • Why is the le data guaranteed to be on the removeable disk only when the disk is unmounted? • Why is the le meta data copied synchronously but the le data is copied asynchronously.

Solution

Unmount option literally unmount the device and it normally to hard drives exteranl or internal.

Is not common to see it for Flash Drives / Pen Drives / Thumb Drives / SD Card / Digital Camera and any other device that needs to sync before powering down.

This is not the recommended way of doing it when addressing a device that needs to power down first if your intention is to disconnect the device afterwards, as the device will still show in the Nautilus panel..

Have in mind that unmount gives you the ability to mount the device again (since it did not power down or actually eject the device from the system).

If you have an USB CD/DVD Drive and you Eject the medium, this will actually eject the whole device. You would have to insert the CD/DVD image back in to make the device appear again.