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Table Of Diskette Format Structures

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Including Tracks, Sectors, and Total Bytes Available

 

Diskette

Tracks/Side

Sectors/Side 
(Tracks x Sectors)

Sector Size

Bytes Available (Sectors/side x Sector Size x no. of sides)

5-1/4"

Low Density

40 (0-39)

9 (1-9) 
40 x 9=360 Sectors

512

360 x 512 x 2=368,640 (360K)

High Density

80 (0-79)

15 
80 x 15=1200 Sectors

512

1200 x 512 x 2 = 1,228,800 (1.2MB)

3-1/2"

Low Capacity

80 (0-79)

9 (1-9) 
80 x 9=720 Sectors

512

720 x 512 x 2 = 737,280 (720K)

Regular Capacity

80 (0-79)

18 (1-18)  
80 x 18=1,440 Sectors

512

1,440 x 512 x 2  = 1,474,560 (1.44MB)

High Capacity

80 (0-79)

36 (1-36) 
80 x 36=2,880 Sectors

512

2.880 x 512 x 2 = 2,949,120 (2.88MB)

Originally prepared by Tom Lassiter.
  1. Did You Know: Q309623 - Floppy Disk Formats That Are Supported in Windows XP (11/5/2002).
  2. Components
  3. DIMMs
  4. SIMMs
  5. Windows Help
  6. www.msd1.com:  Microsoft 1.68 DMF Format
  7. Win95: 132732 - General Windows 95 Setup Questions and Answers
  8. Win95 & Win98: Q118580 - Troubleshooting DMF Floppy Disks
  9. Win98: Q191054 - Windows 98 DMF Floppy Disk Directory Listing (1 of 6)

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