Sony SLT-A58 - Manual (Page 154)

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Deleting images (Delete)
You can delete all still images or movies in each view mode displayed.
Deleting all images or movies in each view mode
1
MENU button t 1 t [Delete] t [All in Folder] or [All
AVCHD view files]
2
Select [Delete] using v on the control button, then press the
center of the control button.