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What are disks?
A disk is a mass storage block_device which we can write to and read from.
SCSI
- Small Computer System Interface, responsible for handling disk access on most Linux systems.
- It is a protocol that allows communicaton between printers, scanners and other peripherals in addition to harddisks.
Disk schematic
The following diagram represents the basic anatomy of a disk device.
- A disk is divided up into partitions which are subsections of the overall disk. The kernel presents each partition as a block device as it would with an entire disk.
- The disk dedicates a small part of its contents to a partition table: this defines the different partitions that comprise the total disk space.
- The filesystem is a database of files and directories: this comprises the bulk of the partition and is what you interact with in user space when reading and writing data.