What microSD Card Do Dash Cams Need?
Dash cams need an endurance or high-endurance rated microSD card, not a standard consumer card. Endurance cards use flash memory and firmware specifically rated for continuous overwrite — the workload created by loop recording. Standard consumer cards are built for infrequent read/write (photos, occasional file transfers) and commonly fail — corrupted clips, an unreadable card, or silent recording gaps — within months of daily dash cam use.
The one thing to know: Standard consumer microSD cards are built for infrequent read/write and fail early under a dash cam's constant overwrite-loop recording — 'endurance' or 'high-endurance' cards use different flash and firmware rated specifically for that workload.
Why standard cards fail specifically in dash cams
Loop recording means the camera is constantly writing new footage and deleting the oldest segment to make room, in a tight repeating cycle, for as long as the camera runs — often many hours a day, every day. Standard consumer microSD cards are engineered and warrantied around occasional write cycles, not that kind of sustained, repeated overwrite pattern. Endurance-rated cards (e.g., SanDisk High Endurance, Samsung PRO Endurance) use flash memory and firmware explicitly designed and rated for exactly this continuous-overwrite use case.
What to check before buying a card
- Confirm the card carries an explicit "endurance" or "high-endurance" product designation, not just a high capacity or speed rating.
- Check your camera's manufacturer spec sheet for its minimum required speed class — a card that can't sustain fast enough writes can cause dropped frames at high bitrate.
- Match card capacity to your desired retention window using the GB-per-hour math in How Many Hours Fit on a Card?
Frequently Asked Questions
An endurance or high-endurance rated card, not a standard consumer card. Endurance cards use flash memory and firmware specifically rated for constant overwrite (loop recording), while standard cards are built for infrequent read/write and fail early — corrupted files or an unreadable card — under a dash cam's workload.
You can, and it will often work initially, but standard consumer cards are not rated for the continuous overwrite cycling that loop recording performs and commonly fail within months of daily use.
Check the camera's manufacturer spec sheet for its minimum speed class requirement — higher-bitrate cameras (see our bitrate reference) need a card that can sustain writes fast enough to keep up with the encoder's output without dropping frames.
Endurance-rated cards from major manufacturers (SanDisk High Endurance, Samsung PRO Endurance) are positioned as a distinct product line from standard consumer cards; check current listings for the up-to-date price difference rather than relying on a fixed figure here.