page_title: Solid-state drive
section_title: Standard HDD form factors
hierarchical_section_title: Solid-state drive / Configurations / Standard HDD form factors
caption_attribution_description: English: Samsung SATA SSD disk 120 GB - model MZ-7TD120 lid removed Deutsch: Samsung SATA SSD disk 120 GB - model MZ-7TD120 Deckel entfernt
context_page_description: A solid-state drive is a solid-state storage device that uses integrated circuit assemblies to store data persistently, typically using flash memory, and functioning as secondary storage in the hierarchy of computer storage. It is also sometimes called a solid-state device or a solid-state disk, even though SSDs lack the physical spinning disks and movable read–write heads used in hard drives or floppy disks.
  Compared with the electromechanical drives, SSDs are typically more resistant to physical shock, run silently, and have quicker access time and lower latency. SSDs store data in semiconductor cells. As of 2019, cells can contain between 1 and 4 bits of data. SSD storage devices vary in their properties according to the number of bits stored in each cell, with single-bit cells being generally the most reliable, durable, fast, and expensive type, compared with 2- and 3-bit cells, and finally quad-bit cells being used for consumer devices that do not require such extreme properties and are the cheapest of the four.
context_section_description: The benefit of using a current HDD form factor would be to take advantage of the extensive infrastructure already in place to mount and connect the drives to the host system. These traditional form factors are known by the size of the rotating media, e.g., 5.25-inch, 3.5-inch, 2.5-inch, 1.8-inch, not by the dimensions of the drive casing.
caption: An SSD with a 2.5-inch HDD form factor, opened to show solid state electronics. Empty spaces next to the NAND chips are for additional NAND chips, allowing the same circuit board design to be used on several drive models with different capacities; other drives may instead use a circuit board whose size increases along with drive capacity, leaving the rest of the drive empty
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