Bought at retail, fitted to a real vehicle, run for 30 days minimum. Some links earn commission — never a better score.

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Explainer

Why your microSD card keeps failing

Endurance-rated vs ordinary, and how often to format.

Why your microSD card keeps failing

Loop recording destroys ordinary cards. Here is what actually survives it.

Tools required

Tool one, tool two.

Before you start

The warning that saves someone a repair bill.

Step 01 — What endurance rating means

What to do, and what it should look like when it is right.

Step 02 — How often to format

What to do, and what it should look like when it is right.

Step 03 — The six cards, tested

What to do, and what it should look like when it is right.

If it goes wrong

The two or three most likely mistakes and how to undo them.

Everything here was bought, fitted and lived with.

No review units, no press trips, no scores traded for commission.

How we test