IBM 3274 51C Maintenance Information page 198

E.l.3.3 Diskette Safety
Return a diskette to its envelope when it is
removed from the diskette drive.
Do not lay diskettes near smoke or other sources
that can cause the disk to become contaminated.
Do not use clips or rubber bands on a diskette.
Do not place heavy books on diskettes.
Do not touch or attempt to clean diskette surfaces.
Contaminated diskettes will not function correctly.
Do not place diskettes near magnetic materials.
Data can be lost from a diskette exposed to a
magnetic field.
Do not expose diskettes to heat greater than
51.7° C (125°F) or direct sunlight.
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Do not write outside the label area on diskettes.
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Appendix E. IBM 3150 Diskette Drive Maintenance E-9