The first track or so contains the DOS information, including the directory structure, file and attributes list, disk label (if one). img/.ima file is a raw dump of each sector in order from Track 0/Sector 0 to Track 80/Sector 18 (assuming a 1.44MB disk). Thus, for example, the capacity of a 360KB = 2 x 40 x 9 x 512. These are the standard formats which DOS games used :Įach sector within a track stores 512 bytes of data. All compatibles released after 1982, even the PCjr., come with double sided drives. The earliest drives that came with the IBM PC in 1981 were also single sided, but these were replaced by dual sided drives within a year. Except for the earliest programs, all regular IBM floppy disks use two sides. Let me start by describing the physical workings of a floppy disk, then an overview of copy protection methods, then finally solutions for them, both old and new.Ī floppy disk, whether on a 5.25" or a 3.5" disk, is divided up into sides, tracks and sectors. I would like to concentrate on the first in this entry.
In collecting and playing floppy disk IBM PC compatible games from the DOS and pre-DOS era, there are two obstacles, copy-protection and media decay.
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