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Partition Master 10.1
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This operation is for converting a primary volume to a logical volume and applies to basic disks whose partitioning scheme is MBR.
A basic MBR disk can have either up to four primary volumes, or up to three primary volumes plus an unlimited number of logical volumes. You need to convert a primary volume to logical if you want to create a fifth volume on a disk that currently has four primary volumes.
To convert a primary volume to logical: