Floppy Disk Types and Specifications
Tableaux de référencement des types de disquettes et leurs spécifications
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Floppy disk types and specifications (94.3 Ko)
|
Category |
Specification |
360 KB 5.25" |
1.2 MB 5.25" |
720 KB 3.5" |
1.44 MB 3.5" |
2.88 MB 3.5" |
|
Drive |
Read/Write Heads (Data Surfaces) |
2 |
2 |
2 |
2 |
2 |
|
Spindle Motor Speed |
300 RPM |
360 RPM |
300 RPM |
300 RPM |
300 RPM |
|
|
Controller |
Minimum Controller Transfer Rate |
250 Kbits/s |
500 Kbits/s |
250 Kbits/s |
500 Kbits/s |
1 Mbits/s |
|
Media |
Track Density (TPI) |
48 |
96 |
135 |
135 |
135 |
|
Bit Density (BPI) |
5,876 |
9,869 |
8,717 |
17,434 |
34,868 |
|
|
Density Name |
Double Density (DD) |
High Density (HD) |
Double Density (DD) |
High Density (HD) |
Extra-High Density (ED) |
|
|
Geometry |
Tracks (Cylinders) |
40 |
80 |
80 |
80 |
80 |
|
Sectors Per Track/Cylinder |
9 |
15 |
9 |
18 |
36 |
|
|
Total Sectors Per Disk |
720 |
2,400 |
1,440 |
2,880 |
5,760 |
|
|
File System |
Cluster Size |
2 sectors |
1 sector |
2 sectors |
1 sector |
2 sectors |
|
Maximum Root Directory Entries |
112 |
224 |
112 |
224 |
448 |
|
|
Capacity |
Unformatted Capacity |
~480 KB |
~ 1.6 MB |
~1 MB |
~2 MB |
~4 MB |
|
Formatted Capacity (binary kilobytes) |
360 |
1,200 |
720 |
1,440 |
2,880 |
|
|
Formatted Capacity (bytes) |
368,640 |
1,228,800 |
737,280 |
1,474,560 |
2,949,120 |
|
|
File System Overhead (bytes) |
6,144 |
14,848 |
7,168 |
16,896 |
17,408 |
|
|
Total Usable Capacity (bytes) |
362,496 |
1,213,952 |
730,112 |
1,457,664 |
2,931,712 |
|
|
Total Usable Capacity (binary KB) |
354 |
1,185.5 |
713 |
1,423.5 |
2,863 |
|
|
Total Usable Capacity (binary MB) |
0.346 |
1.158 |
0.696 |
1.390 |
2.796 |
