oblivion resistance

Old geekery. Part 1.

Gustavo Seidler — Fri, 03 Oct 2008 03:34:55 +0000

3½ Double Density Floppy Disc:

Format: FAT12
Media id: 0xF9
Total sectors: 1440
Total tracks: 80
Sectors per track: 9
Total clusters: 720
Sectors per cluster: 2
Sector size: 512 bytes
Boot sector: 1
Number of FATs: 2
Sectors per FAT: 3
Number of directory listings: 112
Size of each directory listing: 32 bytes
Directory sectors: 7
Data sectors: 1426 => actual free space: 730.112 bytes

Basic structure:

Boot sector: Sector 0 => 1 sector. Start at 0×0000
1st FAT: Sectors 1, 3 and 3 => 3 sectors. Start at 0×0200
2nd FAT: Sectors 4, 5 and 6 => 3 sectors. Start at 0×0800
Directory: Sectors 7 thru 13 => 7 sectors. Start at 0x0E00
Data: Sectors 14 thru 1439 => 1426 sectors. Start at 0x1C00