Disk Image Types

ATR

File starts with a 16-byte header:

0     - 0x96
1     - 0x02
2     - data size in paragraphs, low byte
3     - data size in paragraphs, mid byte
4     - sector size in bytes, low byte
5     - sector size in bytes, high byte
6     - data size in paragraphs, high byte
7..15 - unused, or contain APE extensions:

7..10 - 32-bit CRC
15    - bit 0: 1 = write protected
        bit 1: 1 = "authenticated" image
            bits 2..7: unused (0)

Paragraph = 16 bytes.

Data start at byte 16.

// TODO: authentication

Happens to be found in gzipped form with .ATR.GZ or .ATZ extensions.

XFD

Raw blob with no metadata whatsoever. File length may not be a multiply of a valid sector size, so virtually any file may be an XFD image. ATR files are sometimes given the XFD extension for unknown reason.

Happens to be found in gzipped form with .XFD.GZ or .XFZ extensions.

DCM

http://atariki.krap.pl/index.php/DCM

PRO

// TODO