HP R717 - Manual (Page 97)

97 Reviewing Images and Video Clips
• Undelete Last—Recovers the most recently deleted image.
(This option is only displayed after a Delete operation has
been performed.) You can recover only the most recently
deleted image, including entire panoramic sequences.
Once you proceed to another operation, for example,
powering off the camera or taking another picture, the
delete operation you performed is permanent, and the
image is no longer recoverable.
NOTE: When one shot from the center of a panoramic
sequence is deleted, all of the panorama tags for that
panoramic sequence are removed. Each image becomes
an individual still image. However, if you delete an image
from the beginning or end of the panorama, and there
are at least 2 images remaining, the panoramic sequence
is preserved.