IBM 5280 User's Setup Procedures page 88

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3. Now, find the appropriate address and diskette drive type on
the label sheet. The address and drive type are both on the
same label.
4. Remove the orange label(s).
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5. Stick the label into the recess area near the diskette drive.
6. Repeat steps 1 through 5 until all the diskette drives on every
data station are labeled.