IBM RT PC Manual To Operations page 33

4. Close the diskette drive by rotating the drive lever clockwise.
Warning: Do not open the diskette drive or remove the diskette
when the in-use light is on. Data on the diskette may be
destroyed.
When the in-use light is on, it indicates that the system unit is using the
diskette drive.
5. To remove the diskette from the diskette drive, rotate the diskette drive
lever counterclockwise and pull the diskette out.
6. Insert the
diskett~
into the storage envelope.
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