Yamaha CS1D Operating Manual page 219

Chapter 15. Using a memory card to save/load data
Never insert or remove a memory card while the
card is being accessed.
If the EVENT RECALLING button is set to
"ENABLE" in the MIDI/GPI/TC function TC
EVENT screen, the LOAD button will be grayed,
and loading will not be possible.
You must first switch the EVENT RECALLING but-
ton to "DISABLE."
It is not possible to recall or save a scene while load-
ing. If you press the panel [STORE] switch or
[RECALL] switch, a message of "CANNOT
STORE!" or "CANNOT RECALL!" will appear.
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