Linux Disk Management, partitioning, loading

Common physical hard-disk interfaces:

The same port: IDE (133MB/S), SCSI (640MB/S)

Serial port: SATA3 (6Gbps), SAS (6Gbps), USB (480MB/S)

Storage mechanism of mechanical hard disk:

The motor drives the disc to rotate, each disc is divided into n concentric circles, called tracks, and the same track for multiple platters is called the cylinder (cylinder), each cylinder is divided by an angle into a slice called Sector (sector). Because virtual sector technology is applied, the sector size of each track is equal to 512bytes.

The same cylinder on the disk belongs to the same partition.

The track of the most inner ring of a disk is called a 0 track , the first sector of the disk is called the 0 Track 0 sector is reserved, cannot be partitioned, called the MBR (Master boot record master boot record), the sector is the boot sector, Where the front 446bytes puts the bootloader (a piece of code), the 64bytes partition table , the 2bytes memory authentication information. The partition table has one partition information per 16bytes, so the MBR can only support up to 4 primary partitions. The fourth 16bytes can be created as an extended partition, with the address of a new sector, and a new sector can create more 16bytes, which is where logical partitioning occurs. logical partitions must be numbered on Linux starting from 5 .

MBR supports a single hard drive with a capacity of no more than 2T.

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Partitioning tool: Fdisk

Fdisk-l view disk and partition information.

FDISK/DEV/SDA starts the partition and enters the interactive.

　　　　　　　　

Linux Disk Management, partitioning, loading