To Remove The Memory Card - Sony a7SIII Help Manual

You can change the memory card slot for recording by selecting MENU →
Settings] → [Prioritize Rec. Media]. The Slot 1 is used in the default settings.
To record the same image on two memory cards at the same time or to sort recorded images onto two memory card slots by the
image type (still image/movie), select MENU →

To remove the memory card

Open the memory card cover and make sure that the access lamp (A) is not lit, then push in the memory card lightly
once to remove it.
Related Topic
Memory cards that can be used
Notes on memory card
Format
Rec. Media Settings (still image/movie): Prioritize Rec. Media
Rec. Media Settings (still image/movie): Recording Mode
Selecting which memory card to play back (Select Playback Media)
(Shooting) → [Media] → [
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(Shooting) → [Media] → [
Rec. Media Settings] → [Recording Mode].
Rec. Media