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SD / microSD Card diagnostics

Test what the browser can see. Know when it cannot.

Use OS/card-reader recognition first; DeviceOK focuses on safe troubleshooting boundaries because browsers cannot generically inspect card health.

Run these first

Relevant live checks

Device & Browser Information CheckSee browser-exposed screen, viewport, language, CPU-thread class, memory class, connection hints, and platform information without installing software.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Test the card in another known-good reader

  2. 2

    Check write-lock adapter position

  3. 3

    Do not format if important files have not been recovered

What DeviceOK/browser can help check
  • Help distinguish browser file picker issues after the card mounts
What this browser page cannot prove
  • Read flash wear/health universally
  • Repair filesystem corruption
  • Test the card-reader electrical interface directly