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primary partitionA reserved part of a Windows disk, which is identified by a drive letter. The entire C: drive is often one primary partition; however, multiple partitions are created for a user's own organizational purposes or for booting into different operating systems. See extended partition, master boot record, partition and basic disk.
|Windows Primary Partitions|
|Depending on the boot method and partition tables used in the PC (MBR or GPT), from four to 128 primary partitions can be created. See MBR disk, GPT and UEFI.|