DOS format disk into 4 primary partitions. There is a boot flag field in the partition to indicate to the boot loader ito boot from this partition. Some bootloader may not follow this convention (eg. unix) and has their one way to identity the partition to boot.
If there is a need to have more than 4 partitions (drives in Windows term), multiple logical partitions can be defined in a primary partition. However, the windows boot loader will not be able to see and boot from logical partitions.
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