Sony RMT-811 Service Manual page 116

Erasing the cassette memory data
Erasing all the data in cassette memory
(1) Set the POWER switch to VCR or CAMERA.
(2) Press MENU to display the menu display.
(3) Turn the SEL/PUSH EXEC dial to select
(4) Turn the SEL/PUSH EXEC dial to select ERASE ALL, then press the dial.
(5) Turn the SEL/PUSH EXEC dial to select OK, then press the dial. "OK" changes
(6) Press the SEL/PUSH EXEC dial.
To cancel erasing
Select RETURN in step 5 or 6, then press the SEL/PUSH EXEC dial.
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to "EXECUTE."
"ERASING" flashes for about two seconds and "COMPLETE" appears after
erasing all the data.
, then press the dial.