Magnetic Disk
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The 64DD reads data stored on magnetic disks that use a proprietary logical layout.
Logical Layout
Disks are composed of:
- 2 Heads.
- 1175 Tracks per Head.
- 2 Blocks per Track.
- 90 Sectors per Block. (85 Data Sectors, 4 C2 Sectors, and 1 Gap Sector.)
However, only Data Sectors are present in disk dumps.
Sector size varies depending on the Zone:
Zone # | Sector Size |
---|---|
0 | 232 Bytes |
1 | 216 Bytes |
2 | 208 Bytes |
3 | 192 Bytes |
4 | 176 Bytes |
5 | 160 Bytes |
6 | 144 Bytes |
7 | 128 Bytes |
8 | 112 Bytes |
Zone range varies depending on the Head:
Head # | Zone Range |
---|---|
0 | Zone 0 - Zone 7 |
1 | Zone 1 - Zone 8 |
System Area
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