Sony PMW-160 Operating Instructions Manual page 105

Fragmentation
If pictures cannot be recorded/reproduced
properly, try formatting the recording medium.
While repeating picture recording/playback with
a certain recording medium for an extended
period, files in the medium may be fragmented,
disabling proper recording/storage. In such a
case, make a backup of clips in the medium then
perform formatting of the medium using "Format
Media" (page 92) in the OTHERS menu.
Important Notes on Operation 105