Canon PowerShot SX230 HS User Manual page 139

Select Range
Choose All Images
Choose [Select Range].
Follow Step 2 on p. 138 to choose [Select
Range], then press the m button.
Choose images.
Follow Steps 2 and 3 on p. 136 to choose
images.
Erase.
Press the p button to choose [Erase],
then press the m button.
Choose [All Images].
Follow Step 2 on p. 138 to choose [All
Images], then press the m button.
Erase.
Press the qr buttons or turn the  dial to
choose [OK], then press the m button.
Erasing All Images
139