IBM 6C4 - Manual (Page 37)

Using the 3.5-Inch Diskette Drive
A 1.44 MB diskette drive is an optional feature for this system. Contact your sales
representative before purchasing a diskette drive for this system.
The 1.44 MB diskette drive can format, read, and write diskettes compatible with the
following diskette drives:
v 1.0 MB diskettes with 720 KB formatted data capacity
v 2.0 MB diskettes with 1.44 MB formatted data capacity (High Density)
Format the diskette according to its specified capacity.
Write-Protecting 3.5-Inch Diskettes
Write-protecting diskettes is necessary so that important information is not accidentally
lost. When diskettes are write-protected, you can read information from the diskettes,
but you cannot write information to them.
There is a write-protect tab on the 3.5-inch diskette. To locate the write-protect tab, turn
the diskette over with the label facing down.
To prevent writing onto a diskette, slide the write-protect tab to open the protect slot, as
shown in the illustration.
To allow writing onto a diskette, slide the write-protect tab to cover the protect slot, as
shown in the illustration.
Chapter 2. Using the System 19