In the extended partition, the user can create logical drives (i.e., "simulate" several smaller-sized hard drives). A disk may contain up to four primary partitions (only one can be active), three primary, and one extended partition. Three types of partitions exist: primary, extended, and logical. That is unless you want to create several partitions to have several drives on which data is kept separately. A single partition of the full disk size is sufficient if you use just one operating system. Therefore, logically there will be at least as many partitions as operating systems using different file systems. It can be used, for example, to install different operating systems that do not use the same file system. It involves creating areas on the disk where data will not be mixed. The partitioning of a hard drive occurs after the drive has been physically formatted but before it is logically formatted.
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