Disk - Sector (Physical block)


Block on a disk.


On Macintosh and UNIX drives, sectors usually are grouped into cluster (logical blocks) that function as the smallest data unit permitted. Since these blocks often are defined as a single sector, the terms block and sector are sometimes used interchangeably in this context.

In essence, the sectors are numbered 0, 1, 2, etc. up to (N-1), where N is the number of sectors on the disk.

The master boot record (MBR) and the boot sector are two disk sectors that are critical to the startup process.

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