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2. Hard disk drive - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive

   A hard disk drive (HDD), hard disk, hard drive, or fixed disk [a] is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.

3. Hard disk drive platter - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive_platter

   Hard disk with platter Inside view of a hard disk Hard disk drive platter, 2.5" Samsung MP0402H. A hard disk drive platter or hard disk is the circular magnetic disk on which digital data is stored in a hard disk drive. [1] The rigid nature of the platters is what gives them their name (as opposed to the flexible materials which are used to ...

4. Disk sector - Wikipedia

   en.wikipedia.org/wiki/Disk_sector

   For most disks, each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs), and 2048 bytes for CD-ROMs, DVD-ROMs and BD-ROMs. [1] Newer HDDs and SSDs use 4096 byte (4 KiB) sectors, which are known as the Advanced Format (AF). The sector is the minimum storage unit of a hard drive. [2]

5. Disk storage - Wikipedia

   en.wikipedia.org/wiki/Disk_storage

   A disk drive is a device implementing such a storage mechanism. Notable types are hard disk drives (HDD), containing one or more non-removable rigid platters; the floppy disk drive (FDD) and its removable floppy disk; and various optical disc drives (ODD) and associated optical disc media.

6. Cylinder-head-sector - Wikipedia

   en.wikipedia.org/wiki/Cylinder-head-sector

   Cylinder, head, and sector of a hard drive. Cylinder-head-sector (CHS) is an early method for giving addresses to each physical block of data on a hard disk drive. It is a 3D-coordinate system made out of a vertical coordinate head, a horizontal (or radial) coordinate cylinder, and an angular coordinate sector. Head selects a circular surface ...

7. Disk read-and-write head - Wikipedia

   en.wikipedia.org/wiki/Disk_read-and-write_head

   A hard disk head and arm on a platter Microphotograph of a hard disk head. The size of the front edge is about 0.3 * 1.2 mm. The functional part of the head is the round, orange structure in the middle. Also note the connection wires bonded to gold-plated pads. Read–write head of a 3 TB hard disk drive manufactured

8. Density (computer storage) - Wikipedia

   en.wikipedia.org/wiki/Density_(computer_storage)

   For example, the first commercial hard drive, IBM's RAMAC in 1957, supplied 3.75 MB for $34,500, or $9,200 per megabyte. In 1989, a 40 MB hard drive cost $1200, or $30/MB. And in 2018, 4 Tb drives sold for $75, or 1.9¢/GB, an improvement of 1.5 million since 1989 and 520 million since the RAMAC.

9. Disk pack - Wikipedia

   en.wikipedia.org/wiki/Disk_pack

   The IBM 2315 disk cartridge stored 1 megabyte of data. An early disk cartridge was a single hard disk platter encased in a protective plastic shell. When the removable cartridge was inserted into the cartridge drive peripheral device, the read/write heads of the drive could access the magnetic data storage surface of the platter through holes in the shell.