Easy access for retrieval Greater resolution Not updatable. More expensive than rotary. Microfiche Jackets Documents with high retrieval. Easy for frequent retrieval, can be duplicated to fiche. Must be inserted manually.
Labor costs increase because jacket insertion is time consuming.
Aperature Cards Required by some computer-assisted retrieval systems. Film must be manually inserted. Most expensive, labor costs increased because each exposure must be cut and inserted. Silver Duplication Secondary original Closest method to original film, longer life, can be used for both positive and negative duplication. More fragile than diazo film scratches and can become damaged More expensive than diazo.