Sony ICD-AX412F Operating Instructions Manual page 32

To erase another file
Proceed with steps 2 through 5 in "Selecting a file and erasing it."
To erase a part of a file
Divide the file into two files first (page 67), and then proceed with steps 3 through 5 in
"Selecting a file and erasing it" after selecting the file you want to erase.
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