01
Separate the camera's limit from the card in the box
‘Supports 256 GB’ describes a compatibility limit. It does not say that a 256 GB card is included. For example, the N5 information lists a 128 GB included card and support up to 256 GB. The package and the maximum capacity are two separate lines to compare.
The shared IIWEY guide sets a different limit for L7 and L9: up to 128 GB. Other model-specific restrictions take precedence over a family-level rule. A larger card that the device cannot use reliably is not an upgrade.
| Specification | Question it answers | Buying implication |
|---|---|---|
| Included card | What arrives with this variant? | Whether an extra card belongs in your initial budget |
| Maximum supported capacity | What capacity can this exact model use? | The ceiling for a later upgrade |
| Required speed / compatibility | Can the card sustain the recording workload? | Capacity alone is not enough |
02
Estimate retention from total bitrate—not resolution alone
Recording time depends on the combined bitrate of every active channel. As an illustrative calculation, 128 decimal GB at a constant total bitrate of 40 Mb/s gives about 7.1 hours before allowing for formatting, protected files and other overhead. The same capacity at 80 Mb/s gives about 3.6 hours. These are arithmetic examples, not IIWEY model runtime claims.
The estimate is: capacity in GB × 8,000 ÷ total Mb/s ÷ 3,600. Actual files and the selected recording mode provide a better estimate because bitrate may vary. Two cameras and four cameras cannot be assigned the same retention time merely because both packages include 128 GB.
03
Understand what loop recording keeps
Loop recording records a sequence of shorter files and reuses the space occupied by older ordinary recordings. Shorter segments can make an event easier to locate; they do not necessarily mean the camera deliberately leaves gaps between clips.
Event or G-sensor files may receive protection from ordinary overwriting. That protection is useful, but it is not unlimited backup. Protected files can consume space, and a card can fail. If you need long-term retention, include a routine for copying important originals to another device.
- Check how the model separates ordinary and protected files.
- Allow space for every active camera, not just the front file.
- Never treat formatting as harmless maintenance when important footage remains on the card.
04
Recording modes can change the comparison
A front-camera maximum resolution may refer to a different mode from the one used with all cameras connected. The N5 information, for example, describes both four-channel 1080p and a 2.5K/1080p/1080p/720p combination. Compare the whole configuration, including frame rate where available.
If you want a higher-resolution front view and broad coverage, confirm the rear and side specifications in the same mode. Do not assume that a 4K label applies to every lens. A lower-resolution view may still add useful context, but the trade-off should be deliberate.
05
Spend on reliable storage before unused capacity
Use genuine media that meets the exact model's requirements. The shared guide calls for Class 10/U3 or faster for its covered Dash Cam models; buying a card from a reliable source matters because a printed speed mark does not establish authenticity.
A card intended for repeated recording is useful, but its endurance label does not override device compatibility. Check the model's capacity limit, then the chosen card and recording mode. If the supplied card already meets your retention needs, a larger purchase may provide less value than another feature you actually need.
