Hard Disk Partitioning essentials

First, the main boot sector

1. The main boot sector is the 1th sector of the 0-side 0-bar on the hard drive
2. Main boot record area MBR (Master boot Record): The first 446 bytes of the main boot sector, where you can install the Boot management program
3. partition table (partition Table): Is the last 64 bytes on the main boot sector, recording the status of the entire hard disk partition

Second, the partition table

1, the hard disk default partition table only 64 bytes, can only write four sets of partition information, the four groups of partition information is called primary (Primary) and extension (Extended) partition
2, the smallest unit of the partition is cylinder (cylinder)
3, when the system to write to disk, must refer to the disk partition table, to a partition for data processing

III. primary partitions, extended partitions, and logical partitions

1, primary partition and extended partition can have up to four (hard disk limit)
2, the extended partition can only have one (operating system limit)
3. Logical partitions are partitions that are continuously segmented by extended partitions
4, primary partition and logical partition can be formatted to access data, extended partition cannot be formatted
5, the number of logical partitions depending on the operating system, in the Linux system, the IDE hard disk has a maximum of 59 logical partitions (number 5th to 63rd), SATA hard disk has 11 logical partitions (5th to 15th number)

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Hard Disk Partitioning essentials