There are hidden partitions on your hard drive keeping your computer safe - here's how to find them

Your hard drive may appear like it doesn't have all of its space available, but its actually hidden partitions. Here's why you may need them.
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Partitioning a hard drive: for Mac, Windows, and Linux

Partitioning means writing the hard drive sectors that will make up the partition table. It contains information on the partition, including sector size, position with respect to the primary partition ...