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. Wear or durability of the magnetic coating can also be adversely affected by this liner property at high humidity and high temperature. Certification yield does not measure liner quality. Diskette manufacturers must instead focus on interchange, higher quality, and lower cost. Minimize debris and optimize cleanability, torque, and wear.