Every time update-grub is run, whether manually by the user or automatically by different system functions, any modifications made to the /boot/grub/grub are rewritten.
The FileSystem Table configuration file, or fstab, lists all of your computer's partitions and storage devices. The fields in the file are separated by tabs or spaces and are organized as follows: device-spec - The device to which the partition entry corresponds, as specified by its name, label, UUID, or other identifier. A PC HDD with MBR partitioning can have a maximum of four primary partitions in its total data storage space, or three primary partitions and an extended partition. Each entry in the Partition Table, which is found in the master boot record, is 16 bytes long and describes a different partition.
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