IBM L40 SX, Quick Reference

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Appendix A. Additional Information 85
It is possible to format a diskette or write (record) information onto a
diskette unintentionally. Important information could be lost. For this
reason, you should write-protect important diskettes. Some diskettes
like the Reference Diskette are permanently write protected. When
diskettes are write protected, you can read from the diskettes, but
you cannot write onto them.
To locate the write-protect switch, turn the diskette over with the
label facing down.
- To prevent writing onto a diskette, slide the switch down.
- To enable writing onto a diskette, slide the switch up.
Write-Protecting Diskettes