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Max Official Capacity: 256GB – 512GB (Tested up to 512GB)
Setup / Formatting: Format inside the Dash Cam on first use
Minimum Speed Class: U3 / V30
Technical Note: Modern dashcams perform strict write-speed checks and beep continuously if a slow card is inserted.
⚠ Manufacturer Warranty Notice: Western Digital specifically excludes continuous recording (dashcam and CCTV use) from standard consumer card warranties. Only dedicated High Endurance and MAX Endurance models are covered. View Western Digital / SanDisk Official Warranty Terms ↗
📋 Official Spec / Manual Source: Garmin Official Dash Cam microSD Memory Card Requirements ↗
Need help formatting or fixing an error? See our guides for Windows 10/11, Mac, Dashcam/Camera Card Error Fix, or Garmin Card Degraded Fix.
Get a 128GB or 256GB SanDisk High Endurance or MAX Endurance microSD card. Garmin Dash Cam Mini 3 uses a microSD Card rated U3 / V30. Dashcams run hot on the windscreen and overwrite video non-stop—always use an 'Endurance' card so it doesn't fail when you need footage.
The official maximum supported capacity for Garmin Dash Cam Mini 3 is 256GB – 512GB (tested up to 512GB). For the best balance of price and reliability, our recommended sweet-spot size is 128GB.
Single camera: 64GB ≈ 8 hrs (1080p) / 4 hrs (4K) • 128GB ≈ 16 hrs (1080p) / 8 hrs (4K) • With Rear Camera (dual-channel): 64GB ≈ 4 hrs • 128GB ≈ 8 hrs • 256GB ≈ 16 hrs. Choosing 128GB gives plenty of headroom without overpaying.
Never use non-endurance cards in dashcams—choose SanDisk High Endurance or MAX Endurance. Standard consumer cards (such as SanDisk Ultra) are not built for continuous loop recording and wear out quickly. Crucially, Western Digital's official warranty terms explicitly exclude dashcam and surveillance use on standard consumer cards (only dedicated High Endurance and MAX Endurance models are covered by warranty). Modern dashcams perform strict write-speed checks and beep continuously if a slow card is inserted.
Setup requirement: Format inside the Dash Cam on first use. For best results, format a brand-new card directly inside the Garmin Dash Cam Mini 3 settings menu upon first installation to establish the correct cluster size for continuous loop recording. We recommend reformatting every 3–4 weeks to clear protected event files.
Yes. Unbranded or counterfeit marketplace cards frequently spoof their capacity or fail to sustain U3 / V30 write speeds, leading to corrupted recordings or 'Card Error' warnings. Stick to genuine, branded cards from a reputable retailer to ensure full manufacturer warranty coverage.
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