"Recording a few seconds in advance –
the Pre-Recording function
The pre-recording function allows you to
record sound sources for approximately 5
seconds prior to the point when recording is
actually started.
This is useful for recording during
interviews or when making an open-air
recording so that you will not miss an
opportunity to start recording."

"Press REC.
The PCM recorder enters the recording
standby mode. Pre-recording starts and
sounds for a maximum of the last 5
seconds are buffered in the memory."

так что pre-recording buffer, как сказано выше, будет "в тему".

mass storage class bulk-only transport
pre read/pre write buffer
pipelined ECC engine

так что pre-write buffer, как сказано выше, будет "в тему".