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"Full Filesystem" (FFS) Extraction - extraction of all available data including user-inaccessible operating system data, data from apps etc.

Generic extractions getting data through typical OS APIs is called logical extraction. That would get your pictures, files, call logs, messages etc. filesystem extractions are the level above.

A logical extraction could tell you you had a bitcoin wallet app, while an FFS could clone the whole wallet's data (ignoring wallet backups being saved in user's files).