Liner should be manufactured in a very clean environment. Metal particles, wood, cardboard, or other contaminants should not be present. Liner debris can affect both certification yields and also soft errors after transportation and storage. Vibration can cause particles to transfer from the liner to the surface of the disk where they cause soft errors or even permanent damage. Liner affects torque, an important diskette property.
High torque can cause problems in low power notebook drives.
Low torque results in chucking problems, especially in high speed duplication drives. Low torque may also indicate poor cleanability. Proper torque requires a match between liner thickness and coefficient of friction, lifter tab material and angle, and internal shell clearances. Rayon expands longitudinally at high humidity. This can buckle or wrinkle the liner and thereby increase torque.