Hard Drive Classification

Hard Drive (HDD) Classification: Hard drives can be classified according to their internal technology, according to their location or according to their interface.

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Classification of the hard drive according to its internal technology

Magnetic hard disks (HDD = hard disk drive)
Hard disk drives are also known as rigid disks. They use one or more spinning disks and store data magnetically. If you’re using a desktop computer, it most likely has an internally installed HDD.

Solid-state drives (SDD = solid-state drive)
Solid- state drives that have no moving mechanical parts, but use flash memory like that found in USB drives. Solid-state drives are used in modern laptops, and are often a bit more expensive.

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Hybrid Hard Drives (HDD and SDD)
Hybrid hard drives combine the capacity of an HDD hard drive with the speed of SSD drives through the placement of traditional spinning platters and a small amount of high-speed flash memory

Hard Drive Classification according to its location

Internal Hard Drives Internal
hard drives are physically inside the computer, they are directly connected to the computer’s motherboard.

External Hard Drives External
hard drives connect to the computer through an external USB or SATA connection. An external drive is regularly used to save backup data or files that you use infrequently.

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Classification of the hard disk according to its interface type

Hard Drive (HDD) Classification: The interface indicates the type of connection that hard drive to connect with other devices or with the motherboard of the computer.

IDE
IDE ( Integrated Electronic Device) is also known as Parallel ATA or PATA. A parallel ATA has a 40-pin connector, jumper, and a 4-pin for power. 

SATA SATA stands for Serial ATA, SATA hard drives are physically the same shape and size as IDE drives, they differ in the type of connectors they use. A SATA drive uses a thinner data cable. 

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USB
The USB interface is generally used to connect external hard drives. The USB interface is also used to connect the mouse, keyboard, monitor, external DVD, etc. that connect via a USB port.

PCIe
The PCIe interface allows you to connect your hard drive using a PCI Express port in the same way you would connect an internal card.

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