If you prefer more than four partitions on the disk, you should make one primary partition an extended partition to create logical partitions. Since the disk partition table is 64bytes in total and the information of each partition is 16bytes, you can create at most four primary partitions. You can only use the extended partition to create multiple logical drives to utilize the space. Unlike a primary partition, an extended partition is a "concrete" storage unit with a drive letter and file system. Excluding the space taken by primary partitions, the space left on a disk is called an extended partition. Primary partitions are those you can install the operating system on and make active in order to boot the computer from it. Partitions can be categorized as primary partitions and extended partitions on an MBR disk. To use a disk for data storage, you need to divide it into chunks called partitions. Thus, when it's corrupted, you won't be able to use the disk until you rebuild MBR. The information in this sector describes how the partitions are organized on the current storage device. It takes up 512bytes and contains the master boot code (446bytes), disk partition table (DPT, 64bytes), and the boot signature (2bytes) which marks the end of the MBR sector.
The first sector on both an MBR disk and a GPT disk is the MBR sector. Here is a simplified structure of an MBR disk. It's named after the boot sector located at the very beginning of a drive (the first sector) called MBR. MBR, Master Boot Record, is an older disk-type first introduced with IBM PC DOS 2.0 in 1983. PAGE CONTENT: What Is MBR What Is GPT What's the Difference Between MBR and GPT Is GPT or MBR Better Does Windows 10 use GPT or MBR How to Check the Partition Style of a Disk How to Interconvert MBR and GPT What Is MBR
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