Why was fsck priority introduced in /etc/fstab?

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http://unix.stackexchange.com – Inside the /etc/fstab file, in the sixth column, there is a number that corresponds to whether a filesystem should be scanned for errors. Possible values are: 0 - skip 1 - high priority 2 - low priority Why was fsck 'priority' introduced in /etc/fstab? (HowTos)