The right flash specification depends less on the product type than on the workload and the buyer. A dashcam writes continuously in a loop and cares about sustained write behaviour. A security installation cares about total bytes written and thermal range. An embedded design cares about whether the part enumerates reliably on the host and whether it will still be available in five years. A promotional order cares about whether the drive still works in a customer's drawer six months later. These are different problems with different answers, so we have written a separate page for each.
A dashcam writes continuously and overwrites the oldest footage in a loop, which is the hardest workload you can give a flash card. What matters is not peak speed but sustained write behaviour, stable capacity and batch-to-batch consistency — the same card in unit 1 and unit 5,000.
Surveillance recording is a 24/7 overwrite workload with one extra constraint: the device is often installed somewhere that is expensive to revisit. That makes total bytes written, thermal behaviour and long-term reliability more important than burst speed.
When flash is designed into a product rather than plugged into it, the buying criteria change completely. You need a defined part with known silicon, a controller solution that the host will enumerate reliably, mechanical dimensions that fit your enclosure, and a supply plan that lasts as long as the product does.
A branded USB drive is a product people keep, which is why it works as a giveaway — but only if it still works months later. The failure mode buyers worry about is a drive that carries their logo and then stops being readable, which damages the brand it was meant to promote.
Industrial, POS and medical devices place three demands on storage that consumer parts are not specified for: a wider operating temperature range, a documented duty cycle over a long service life, and continuity of supply across years of production. A UDP module soldered onto your board (11.3 × 24.8 × 1.45 mm, 128MB–128GB) is the usual choice where storage must be fixed and tamper-resistant; a semi-finished board (12 × 44 × 4.5 mm) fits where you already have an enclosure.
