Size And Purpose of The Hard Disk Introduce
The size and purpose of the hard disk can be divided into:
0.85 inch, mostly used in mobile phones and other portable devices;
1 inch, mostly used in digital cameras (CF type II interface);
1.8-inch, for some laptops and external hard drive cases;
2.5-inch, commonly used in laptops and external hard drive boxes;
3.5-inch, most used in desktop computers. An external hard disk box with a 3.5" hard disk requires an external power supply.
5.25 inches, mostly used by early desktop computers. No manufacturer produces it today.
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