An ADF is a sector dump, it only contains the "payload" data on the disk in a sequential manner.
An extended ADF is an MFM stream dump, it contains also the track and sector headers present around the data on the physical disk. Also if the track format is not an Amiga DOS format, a raw MFM stream can still convey the same information. For example MS-DOS floppies can be dumped into eADF. Some copy protections are weak enough to be represented as an eADF, other custom formats require more analysis and a more versatile format, hence the CAPS/SPS IPF format.
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