Pentax K-5 Operating Manual page 180

Youcandelete allsavedimages atonce.
Deleted images canno t berestored. . ...........................................................
I Select [DeleteAll Images] in the [F¢-IPlayback 1] menu
and
press the four-way controller ( • ).
The confirmation screen for deleting all images is displayed.
2 Press the four-way controller (•)
to select [Delete All Images].
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3
Press the
OK
button.
All images are deleted.
The confirmation screen appears when
there are protected images. Use the four-
way controller (A • ) to select [Delete All]
or [Leave All] and press the OK button.
When [Delete All] is selected, protected
images are also deleted.