11.2 Zones
As mentioned in the preceding section, each surface of the disk is divided into zones, with head 0 used for zones 0-7 and head 1 used for zones 1-8. Blocks within the same zone are the same size. Thus, either head 0 or head 1 would give the same size for a block in zone 1.
Relation Between Zone Number and Block Size
| Zone Number | Block Size |
|---|---|
| Zone0 | 19720 bytes |
| Zone1 | 18360 bytes |
| Zone2 | 17680 bytes |
| Zone3 | 16320 bytes |
| Zone4 | 14960 bytes |
| Zone5 | 13600 bytes |
| Zone6 | 12240 bytes |
| Zone7 | 10880 bytes |
| Zone8 | 9520 bytes |
The number of tracks included in each zone is as follows.
Relation Between Zone Number and Number of Tracks
| Zone Number | Number of Tracks (Head 0) |
Number of Tracks (Head 1) |
|---|---|---|
| Zone0 | 134 | -- |
| Zone1 | 146 | 146 |
| Zone2 | 137 | 146 |
| Zone3 | 137 | 137 |
| Zone4 | 137 | 137 |
| Zone5 | 137 | 137 |
| Zone6 | 137 | 137 |
| Zone7 | 102 | 137 |
| Zone8 | -- | 102 |
Thus, for example, Zone 0 has 134 tracks, or 268 blocks, and 19,720 bytes of data can be stored in each block. The capacity of Zone 0 is therefore 268 x 19,720 bytes, or 5,284,960 bytes.
Relation Between Zone Number and Zone Size
| Zone Number | Size with Head 0 | Size with Head 1 | Zone Size |
|---|---|---|---|
| Zone0 | 5,284,960 bytes | -- | 5,284,960 bytes |
| Zone1 | 5,361,120 bytes | 5,361,120 bytes | 10,722,240 bytes |
| Zone2 | 4,844,320 bytes | 5,162,560 bytes | 10,006,880 bytes |
| Zone3 | 4,471,680 bytes | 4,471,680 bytes | 8,943,360 bytes |
| Zone4 | 4,099,040 bytes | 4,099,040 bytes | 8,198,080 bytes |
| Zone5 | 3,726,400 bytes | 3,726,400 bytes | 7,452,800 bytes |
| Zone6 | 3,353,760 bytes | 3,353,760 bytes | 6,707,520 bytes |
| Zone7 | 2,219,520 bytes | 2,981,120 bytes | 5,200,640 bytes |
| Zone8 | -- | 1,942,080 bytes | 1,942,080 bytes |
| TOTAL | 33,360,800 bytes | 31,097,760 bytes | 64,458,560 bytes |