[mansplaining]Hi there, it's about image files that end with IMA or IMG extension (sometimes BIN or FD).
They are so-called RAW images. Like raw meat, they're unprepared, so to say.
They're an 1:1 dump of the physical medium, in short. A stream of information stored in a file.
In case of floppies, they do contain all the bits and bytes from the magnetic surface.
There's no information block (header), whatsoever.
It's as if you had recorded a whole side of a vinyl to a music cassette.
You did set the arm at the beginning and push the play+record button on the cassette side
and the cassette deck did record everything to the end.
Other floppy formats like *.CFI (FDCOPY) or *.TD0 (Teledisk) have extra information or do group the sectors/tracks into different blocks.
Some use compression, too. They can be supported by some VMs or emulators, if the author has provided special support.
Or to use a different comparison, it's like with plain text files and MS Word documents.
The MS Word documents do contain formatting that can'tbe understood by an ordinary text editor. [/mansplaining]
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