Disk formats / Diskettenformate#

PDF#

Picture#

Disk formats / Diskettenformate ; Thank you so much Bernhard Paul for providing this information! :-)

FormatSidesTracks/DisksideKBitRecordingBytes/SectorSector/TrackDisksizeATR Size 1)
Single SD140125FM1281890 KB92176 2)
Medium/Enhanced MD140250MFM12826130 KB133136 2)
Double DD140250MFM25618180 KB183952 3)
Quad DS/DD/40 Tr240250MFM25618360 KB368272 3)
Octo DS/DD/80 Tr280250MFM25618720 KB736912 3)
High280500MFM256361.440 KB1474192 3)
Extra High2801000MFM256722.880 KB2948752 3)
Harddisk11xMFM128655358 MB8388496 2)
Harddisk11xMFM2566553516 MB16776592 3)
Harddisk11xMFM5126553532 MB33553936 4)
1) XFD: subtract -16 Bytes (ATR Header), therefore add +384 Bytes! (XFD saves the full boot sector size / disksize, BUT it does not / cannot save the full sector data – these additional 384 bytes are simply empty!)

2) full byte size / disksize (has 128 bytes boot sectors, thus no need to subtract 384 Bytes!)

3) byte size minus boot sectors (has 256 byte boot sectors, thus 3x 128 bytes = 384 bytes already subtracted, since the Atari OS only allows 128 byte boot sectors from diskette! the real disksize is therefore 384 bytes larger, but that data is not transfered from the floppy to the computer! most A8 floppy drives would require a firmware change to read/transfer full 256 bytes bootsectors)

4) harddisks can use full 512 bytes for bootsectors! floppy disks are still limited to 128 bytes bootsectors!

DOS90KB130KB180KB360KB720KB1.440KBRemark
DOS 1.0YNNNNN
DOS 2.0 SmartDOSYNYNNNDOS 2.0s can read 180k after a Reset; DOS 2.0d can read 90k after a Reset!
DOS 2.5YYNNNN
DOS 3.0YYNNNN
DOS 4.0YNYYNN
DOS XEYYYYNN
Bibo DOS 6.xYYYYNN
Turbo DOS 2.xYYYYNN
Top DOS 1.5 ProfYYYY?N
Mach DOS 3.7YNYYNN
MyDOS 4.5xYYYYYNMyDOS requires a special / external formatter to format 1440 KB - one is available e.g. with the CSS Black Box or the CSS Floppyboard, maybe there are also some other external formatters...?!?
Sparta DOS 3.2x/3.3xYYYYYY
Real DOS 2.xYYYYYY
BeweDOS 1.xYYYYNNdisk must be formatted with Sparta DOS or SDX or Real DOS, then Bewe DOS can be copied onto it!
SDX 4.xYYYYYY
Lite DOS 2.x/3.XYYYYY?
Super DOS 5.xYYYYNN
DOS II+D 4.5YYNNNN
DOS II+D 6.xYYYNNN
XDOS 2.4YYYYNNin 360k mode the two disksides are used as two floppy drives (D1: and D2:) in XDOS!
KDOS 1.0YNNNNN
OS A+2.0YNYNNN
DOS XL 2.3xYNYNNN
OS A+4.1N?YYYYYOS A+4.1 was advertized being capable of 128 BpS, 256 BpS and 512 BpS, any format from 128 KB to approx. 15,6 MB!