Hard Disk Drive (HDD)

  • Seagate
  • Toshiba
  • Western Digital (WD)
  • Samsung

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A hard disk drive (sometimes abbreviated as a hard drive, HD, or HDD) is a non-volatile data storage device. It is usually installed internally in a computer, attached directly to the disk controller of the computer’s motherboard. It contains one or more platters, housed inside of an air-sealed casing. Data is written to the platters using a magnetic head, which moves rapidly over them as they spin. Internal hard disks reside in a drive bay, connected to the motherboard using an ATA, SCSI, or SATA cable. They are powered by a connection to the computer’s PSU (power supply unit). Examples of data that may be stored on a computer’s hard drive include the operating system, installed software, and the user’s personal files.