The /etc/fstab and /etc/fstab are two most important directories of Linux operating system. Without them, the operating system and boot loader won't be able to find the hard drive volumes or drives. Thus, you won't be able to boot your system.
The /etc/fstab (contraction of file system table) is a directory of Linux operating system. It is the part of system configuration and lists all the available hard drives, drive volumes and shows how they have to be initialized or integrated in the file system.
This directory contains the description of different file systems and is commonly read by 'mount' and 'fsck' commands. The mount command determines the options that should be used while mounting any device.
The /etc/mtab (short form of mounted file systems table) directory lists all the mounted file systems on your Linux computer. Generally, it is in a specified format and gets automatically altered when mount command is used for identifying which file system is currently in use and how it is mounted (either manually or automatically).
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