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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0110:  Removable Media
      9  III  Floppy Drives

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III  Floppy Drives
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Attaching a Floppy Disk Drive To a PC
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Floppy Disk Form Factors

There are two form factors used for floppy disks in a PC, 5.25" and 3.5". The sizes refer to the floppy disks themselves. The original floppy disk drive for PC’s used a full height (3.25" tall) 5.25" drive bay. The disks themselves had a total capacity of 360KB, known as a Double Density disks. Later, High Density disks were introduced at 1.2MB capacity.

Figure 67: 5.25” Floppy Disk Drive

 


In 1987, IBM introduced the first 3.5" floppy disk drive as part of its PS/2 line of personal computers. The smaller, more durable diskettes hold 1.44 MB of data and are now the de facto standard for floppy drives used in modern PC's. Shortly there after, Toshiba released a floppy disk that would hold 2.88 MB of data, but due to a lack of marketing and the high cost of the diskettes, this technology quickly faded away. Table 14 lists the most standard types of floppy disk and their capacities.


Table 14: Floppy Disk Capacities

Disk Size

Double Density Capacity

High Density Capacity

5¼”

360 KB

1.2 MB

3½”

720 KB

1.44 MB


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