Here, the ID is unique to the particular physical hard disk.
The line you add to fstab is made up of the following fields:
■ Column 1: The partition you want to mount.
■ Column 2: The directory you want to mount the filesystem under.
■ Column 3: The filesystem type (the same that is passed to mount -t).
■ Column 4: A comma-delimited list of filesystem options (noatime, notail, and so on).
■ Column 5: Specified dump priority. The value 0 in this field means "do not back up this filesystem."
■ Column 6: The order in which the filesystem should be checked. If this is a journaling filesystem, this is not needed as a filesystem check is run when the filesystem is mounted by the filesystem driver. The value 0 in this field means "do not perform this check.''
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