Nikon Z 50 Reference Manual page 165

D
The Memory Buffer
The camera is equipped with a memory
buffer for temporary storage, allowing
shooting to continue while photographs are
being saved to the memory card. The
approximate number of images that can be
stored in the buffer at current settings is
shown in the exposure-count displays while
the shutter-release button is pressed halfway.
While photographs are being recorded to the memory card, the
memory card access lamp will light. Depending on shooting
conditions and memory card performance, recording may take from a
few seconds to a few minutes. Do not remove the memory card or
remove the battery until the access lamp has gone out. If the camera is
switched off while data remain in the buffer, the power will not turn off
until all images in the buffer have been recorded. If the battery is
exhausted while images remain in the buffer, the shutter release will
be disabled and the images transferred to the memory card.
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