Epson EQUITY 386/33 PLUS - Manual (Page 24)

Write-protecting Diskettes
You can write-protect a diskette to prevent its data from being
altered. When a diskette is write-protected, you can read it and
copy data from it, but you cannot store new data on it or delete
any files it contains.
To write-protect a 5¼-inch diskette, cover the small,
rectangular notch (shown below) with an adhesive
write-protect tab. Write-protect tabs usually are included in a
new package of blank 5¼-inch diskettes.
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To remove the write protection, peel off the write-protect tab.
1-14 Using Your Computer