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USB Flash Drive diagnostics

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

Separate connection and OS recognition problems from browser upload/file-selection problems without pretending the browser can scan the flash memory itself.

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

    Check OS file manager/disk utility

  2. 2

    Try another port/computer before formatting

  3. 3

    Preserve important data before repair attempts

What DeviceOK/browser can help check
  • Help with browser file-selection/upload behavior once the OS mounts the drive
What this browser page cannot prove
  • Read drive health or NAND wear generically
  • Repair a corrupt filesystem safely in-browser