Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 410

(C): A recordable memory card is inserted.
When the memory card in use becomes full while recording movies, the camera starts recording to the other memory
card.
When recording still images and movies separately to two memory cards:
When [Recording Mode] is set to [Sort(
When either of the memory cards becomes full, both still images and movies are recorded to the other memory card.
When you replace the memory card that has become full with a recordable memory card, the camera starts recording
the two types of images separately with the selected setting again.
Example: When [Prioritize Rec. Media] is set to [Slot 1]
([Recording Mode]: [Sort(
: Images are sorted by the image type.
: Images cannot be sorted.
(A): Recording is no longer possible on the memory card (due to lack of capacity, etc.).
(B): The memory card is removed.
(C): A recordable memory card is inserted.
Hint
Images are recorded to the memory card in the slot displayed on the monitor with an arrow symbol. After the camera switches
the slot using [Auto Switch Media], replace the memory card in the former slot with a recordable memory card.
If [Recording Mode] is set to [Standard], the setting for [Prioritize Rec. Media] will switch automatically when the slot switches. If
you want to record on the slot in use before switching, select the desired slot again using [Prioritize Rec. Media].
If you want to continually record with the settings selected with [Recording Mode] and [Prioritize Rec. Media], set [Auto Switch
Media] to [Off].
Even when the camera records a movie on two memory cards using [Auto Switch Media], the continuous recordable time is
approximately 29 minutes per recording.
Related Topic
Memory cards that can be used
Recordable movie times
Rec. Media Settings: Prioritize Rec. Media
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