Sony NW-A306 Walkman A Series High-Resolution Digital Audio Player (Black) - Manual (Page 211)

Video is stored in cache memory when the Picture Cache Rec function is set to On. Video prior to the function being set to On is
not cached.
Video is not stored in cache memory while a memory card is being accessed, such as during playback, Rec Review, or thumbnail
screen display. Picture cache recording of video during that interval is not possible.
Canceling Picture Cache Rec
Set [Project] > [Picture Cache Rec] > [Setting] to [Off] in the web menu, or press an assignable button assigned with the
[Picture Cache Rec] function.
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