Sony TRV828 - Manual (Page 135)

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“Memory Stick” operations
To cancel deleting all the images in the “Memory Stick”
Select RETURN in step 5, then press the SEL/PUSH EXEC.
While DELETING appears
Do not turn the POWER switch or press any buttons.
If the write-protect tab on the “Memory Stick” is set to LOCK
You cannot delete images.
Deleting images