Fixed memory
From The Glossary of Digital Photography
Also called flash memory. Nonremovable memory built into a digital camera to store images . Fixed memory is used in inexpensive digital cameras that do not have or need removable memory cards.

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
Also called flash memory. Nonremovable memory built into a digital camera to store images . Fixed memory is used in inexpensive digital cameras that do not have or need removable memory cards.