A disk is a block device meaning they read and write data in large units at a time, typically between 512 bytes to 4 kB. Unlike memory, they are persistent but not byte- or word-addressable, only block-addressable.
A disk is a block device meaning they read and write data in large units at a time, typically between 512 bytes to 4 kB. Unlike memory, they are persistent but not byte- or word-addressable, only block-addressable.