Form factors for storage media

5.25″

Full-Height

1980

130.05

146.05

203.2

82.55

All drives in early 1980s; Large capacity drives with many platters as late as the mid-1990s

5.25″

Half-Height

1980

130.05

146.05

203.2

41.4

Early 1980s through early 1990s

5.25″

Low-Profile

1980

130.05

146.05

203.2

25.4

Quantum Bigfoot, mid-to-late 1990s

5.25″

Ultra-Low-Profile

1980

130.05

146.05

203.2

19.05

Quantum Bigfoot, mid-to-late 1990s

5.25″

Ultra-Low-Profile

1980

130.05

146.05

203.2

20.32

Quantum Bigfoot, mid-to-late 1990s

3.5″

Half-Height

1983

63.5

101.6

146.05

41.4

High-end, high-capacity drives

3.5″

Half-Height

1983

76.2

101.6

146.05

41.4

High-end, high-capacity drives

3.5″

Half-Height

1983

95

101.6

146.05

41.4

High-end, high-capacity drives

3.5″

Low-Profile

1983

63.5

101.6

146.05

25.4

Industry standard, most common form factor for PC hard disks

3.5″

Low-Profile

1983

76.2

101.6

146.05

25.4

Industry standard, most common form factor for PC hard disks

3.5″

Low-Profile

1983

95

101.6

146.05

25.4

Industry standard, most common form factor for PC hard disks

2.5″

19 mm Height

1988

63.5

69.85

100.08

19.05

Highest-capacity 2.5″ drives, used in full-featured laptop systems

2.5″

17 mm Height

1988

63.5

69.85

100.08

17.02

Mid-range capacity drives used in some laptop systems

2.5″

12.5 mm Height

1988

63.5

69.85

100.08

12.45

Low-capacity drives used in small laptops (subnotebooks)

2.5″

9.5 mm Height

1988

63.5

69.85

100.08

9.4

Lowest-capacity drives used in very small laptops (mini-subnotebooks)

PC Card

Type I

1990

45.72

54.1

85.6

3.3

Not used for hard disks

PC Card

Type II

1990

45.72

54.1

85.6

5.08

Smaller-capacity expansion hard disks for laptops and consumer electronics

PC Card

Type III

1990

45.72

54.1

85.6

10.41

Higher-capacity expansion hard disks for laptops

Compact

Type I

1994

25.4

42.93

36.07

3.3

Smaller-capacity flash cards for digital cameras, hand-held computers and consumer electronics; not used for hard disks (yet)

Compact

Type II

1994

25.4

42.93

36.07

5.08

Larger-capacity flash cards and hard disks for digital cameras, hand-held computers and consumer electronics

SmartMedia

Standard

1995

37

45

0.76

SmartMedia / SSFDC flash memory card; very thin removable flash format widely used in digital cameras, including Olympus and Fujifilm

Miniature Card

Standard

1995

37

45

3.5

Intel Miniature Card / MiniCard; obsolete flash or SRAM card format used in PDAs, digital cameras, voice recorders and other portable devices

MMC

Standard

1997

24

32

1.4

Original MultiMediaCard removable flash memory card; later MMC variants retained this physical form factor

Memory Stick

Standard

1998

21.5

50

2.8

Original Sony Memory Stick physical form factor; also used by full-size Memory Stick PRO variants

SD

(Secure data)

2001

24

32

2.1

Digital cameras, MP3 players and many other devices. Available in various capacities, standard SD has 9 contacts

Memory Stick

Duo

2002

20

31

1.6

Sony Memory Stick Duo physical form factor; used by Memory Stick Duo, PRO Duo and PRO-HG Duo variants

xD-Picture

Standard

2002

20

25

1.7

xD-Picture Card; compact flash memory format developed by Olympus and Fujifilm, principally for digital cameras

SD

Mini SD

2003

21.5

20

1.4

Mini SD card has 11 contacts

MMC

RS-MMC

2004

24

18

1.4

Reduced-Size MultiMediaCard; smaller MMC form factor used in mobile phones and compact devices; includes physically compatible MMCmobile variants

SD

Micro SD

2005

11

15

1

MicroSD card has 8 contacts

SD

TF (Trans Flash)

2005

11

15

1

TF card has 8 contacts

MMC

MMCmicro

2005

12

14

1.1

MMCmicro miniature MMC form factor developed primarily for mobile phones and other very small devices

Memory Stick

Micro (M2)

2006

12.5

15

1.2

Sony/SanDisk Memory Stick Micro (M2); compact form factor primarily used in mobile phones and other small devices

M.2

2230

2013

22

30

M.2 SSD module, 22 mm x 30 mm; commonly used in compact laptops, tablets and handheld systems

M.2

2242

2013

22

42

M.2 SSD module, 22 mm x 42 mm; compact systems and some laptops

M.2

2260

2013

22

60

M.2 SSD module, 22 mm x 60 mm; less common, used in some older and specialised systems

M.2

2280

2013

22

80

M.2 SSD module, 22 mm x 80 mm; most common M.2 SSD size for desktop and laptop systems

M.2

22110

2013

22

110

M.2 SSD module, 22 mm x 110 mm; commonly used for enterprise, workstation and server SSDs

CFexpress

Type B

2019

29.6

38.5

3.8

CFexpress Type B removable flash memory card; PCIe x2; NVMe; same physical form factor as XQD

CFexpress

Type A

2020

20

28

2.8

CFexpress Type A removable flash memory card; PCIe x1; NVMe; compact form factor

CFexpress

Type C

54

74

4.8

CFexpress Type C removable flash memory card; PCIe x4; NVMe; largest CFexpress form factor