Why Linux can be divided into 4 four primary partitions for a simple explanation

MBR (Master boot Recorder) master boot record that places the hard disk information. MBR can be said to be the most important place of the entire hard disk, because in the MBR recorded two important things, respectively: Boot management program, and disk partition table (partition tables). So we made the hard drive partition, that is, modifying the partition table. Due to the limited capacity of this MBR block, the original design, only designed to 4 partition records, these partition records are called Primary (primary partition) and Extended (extended partition), that is, a hard disk can have a maximum of 4 Primary + Ex tended sector, where Extended can only have one, so if you want to partition into four disk partitions, then at most you can: p + p + p + p p + p + p + E to partition the case. It should be noted that if the above case, 3P +e only three "available" disk, if you want four are "available", you have to partition into 4 p! (because Extended cannot be used directly, it needs to be partitioned into Logical.)

Why Linux can be divided into 4 four primary partitions for a simple explanation