Back to the top Atari Standard Double Density Formatīelow is a detail description of the " Standard Atari Double Density Format" as created by the early TOS.
IBM System 34 Double Density Format (this is the format produced on a DOS machine formatting in 720K) floppies formatted onĮarly Atari machines can't be read on PCs but floppies created on PC can be read on Atari). However the WD1772 ( and therefore the Atari) is capable to read both format without problem but the reverse is usually not true (i.e. Slightly different (nearer to the ISO Double Density Format) as it does not have an IAM byte (and associated GAP),īefore the first IDAM sector of the track (see diagram below). Actually the default Atari Format used by the TOS is IBM System 34 Format for Double Density diskette. Western Digital was recommending to use the IBM 3740 Format for Single Density diskette and to use the The Atari ST uses the Western Digital WD1772 Floppy Disc Controller (FDC) toĪccess the 3 1/2 inch (or to be more precise 90mm) floppy disks. Standard 9-10-11 Sectors of 512 Bytes Format.Once the floppy disk has been low-level formatted, the locations of the tracks and sectors on the This is called low-level formatting,Īnd sometimes it is called "true formatting" since it is actually recording the format that will be used to store information on the disk. This means recording the tracks and marking the start of each sector on each track. The first step in preparing a diskette involves the creation of the actual structures on the surface of the media that are used to hold the data. This information should be specially usefull for duplication (backup) or preservation (images) of Atari ST diskettes (protected or not). The flux level), the FD Drives, the FD controller, etc. There is another page on the Hardware side of the Atari ST Floppy Disks containing information on the Floppy Disk Media (down to This page contains information about ST Floppy disks from a software "point of view": This includes information on FD layouts, Low and High level FD format,
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