Simplify the following text for a Grade 8 native English-speaking person.
Original: Disk partitioning is the act of dividing a hard disk drive into multiple logical storage units referred to as partitions , to treat one physical disk drive as if it were multiple disks .
Simplified: Disk partitioning is about making a physical or logical hard disk usable by the operating system . Each disk partition can be used like a hard disk by the operating system .