MGT format: Difference between revisions
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== MGT/IMG file structure == | == MGT/IMG file structure == | ||
MGT/IMG images can store single or double sided 40 or 80 track disk images, but most of the files are double | MGT/IMG images can store single or double sided 40 or 80 track disk images, but most of the files are double side 80 track disk images. | ||
=== File Header === | === File Header === | ||
Revision as of 17:38, 13 February 2016
MGT/IMG Disk Image Format
The MGT/IMG format was created for storing DISCiPLE/+D disk images for emulation.
This format is member of the Easy Disk Image Formats and contains only the data of sectors.
MGT/IMG file structure
MGT/IMG images can store single or double sided 40 or 80 track disk images, but most of the files are double side 80 track disk images.
File Header
There is no any header or file signature (magic bytes).
Data
Sectors laid from 1st to last within a track:
- Sector 1
- Sector 2
...
- Sector last
Tracks in MGT file
Track data follow the “alt” schema:
- Side: 0 Track: 0
- Side: 1 Track: 0
- Side: 0 Track: 1
...
- Side: 0 Track: 79
- Side: 1 Track: 79
Tracks in IMG file
Track data follow the “out-out” schema:
- Side: 0 Track: 0
- Side: 0 Track: 1
- Side: 0 Track: 2
...
- Side: 0 Track: 79
- Side: 1 Track: 0
- Side: 1 Track: 1
...
- Side: 1 Track: 79
File length
DISCiPLE/+D uses 512 BPS and 10 SPT for disks (see MGT filesystem), so a
- 40 track 1 sided image length is 204800 byte (1×40×10×512)
- 40 track 2 sided image length is 409600 byte
- 80 track 1 sided image length is 409600 byte
- 80 track 2 sided image length is 819200 byte