Form factors for storage media

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The following table lists various hard disk and SSD form-factors and gives their actual size in millimetres.


Factor
Profile
Platter Size (mm)
Width (mm)
Depth (mm)
Height (mm)
Comment
5.25″
Full-Height
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
130.05
146.05
203.2
41.4
Early 1980s through early 1990s
5.25″
Low-Profile
130.05
146.05
203.2
25.4
Quantum Bigfoot, mid-to-late 1990s
5.25″
Ultra-Low-Profile
130.05
146.05
203.2
19.05
Quantum Bigfoot, mid-to-late 1990s
5.25″
Ultra-Low-Profile
130.05
146.05
203.2
20.32
Quantum Bigfoot, mid-to-late 1990s
3.5″
Half-Height
63.5
101.6
146.05
41.4
High-end, high-capacity drives
3.5″
Half-Height
76.2
101.6
146.05
41.4
High-end, high-capacity drives
3.5″
Half-Height
95
101.6
146.05
41.4
High-end, high-capacity drives
3.5″
Low-Profile
63.5
101.6
146.05
25.4
Industry standard, most common form factor for PC hard disks
3.5″
Low-Profile
76.2
101.6
146.05
25.4
Industry standard, most common form factor for PC hard disks
3.5″
Low-Profile
95
101.6
146.05
25.4
Industry standard, most common form factor for PC hard disks
2.5″
19 mm Height
63.5
69.85
100.08
19.05
Highest-capacity 2.5″ drives, used in full-featured laptop systems
2.5″
17 mm Height
63.5
69.85
100.08
17.02
Mid-range capacity drives used in some laptop systems
2.5″
12.5 mm Height
63.5
69.85
100.08
12.45
Low-capacity drives used in small laptops (subnotebooks)
2.5″
9.5 mm Height
63.5
69.85
100.08
9.4
Lowest-capacity drives used in very small laptops (mini-subnotebooks)
PC Card
Type I
45.72
54.1
85.6
3.3
Not used for hard disks
PC Card
Type II
45.72
54.1
85.6
5.08
Smaller-capacity expansion hard disks for laptops and consumer electronics
PC Card
Type III
45.72
54.1
85.6
10.41
Higher-capacity expansion hard disks for laptops
Compact
Type I
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
25.4
42.93
36.07
5.08
Larger-capacity flash cards and hard disks for digital cameras, hand-held computers and consumer electronics
SD
(Secure data)
 
n/a
32
24
2.1
Digital cameras, MP3 players and many other devices. Available in a variety of capacities:-

Standard SD: 4 MB to 4 GB
SDHC: 4 GB to 32 GB
SDXC: 32 GB to 2 TB

Standard SD card has 9 contacts

Mini SD
 
n/a
21.5
20
1.4
Mini SD card has 11 contacts
Micro SD
 
n/a
15
11
1
MicroSD card has 8 contacts
TF (Trans Flash)
 
n/a
15
11
1
TF card has 8 contacts

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