Sony BVP-900 Series System Manual page 310

ACCESS indication
The ACCESS indicator on the MSU-700A/750 shows
the status of the IC memory card.
Indication Meaning or Measures
Off No card is inserted
Lit in green There is a card in the slot. (The battery
condition is good.)
Lit in orange The battery of the card in the slot
begins losing its charge. Although the
data are still maintained, replace the
battery at the earliest opportunity.
Flashes in orange The battery of the card in the slot is
almost exhausted. While the card
stays in the MSU-700A/750, the MSU-
700A/750 supplies the power to the
card. However when the card is
ejected, the data cannot be maintained.
Replace the battery before using.
Lit in red Data are being read/written. If you
eject the disc in this condition, the data
is not guaranteed. All the data may be
lost.
5-25
Chapter 5 File Operations