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USB Drive or Device Not Recognised (MK4)

When your MK4 ignores USB storage you've plugged in, rule out charge-only adapters and NTFS-only sticks first. Try a small exFAT or FAT32 flash drive straight in the port with shallow folders, clean the socket, and skip unpowered hubs.

9" MK4 Multimedia Headunit for Toyota LandCruiser 70 Series (2009-2026)

9" MK4 Multimedia Headunit for Toyota LandCruiser 70 Series (2009-2026)

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Use this article if…

  • Your MK4 won’t mount a USB stick, drive or accessory, not “phone projects but music skips.”
  • If it’s phone data for CarPlay or Android Auto, go to Phone pairing. If your unit won’t boot with a USB inserted, go to Has power, won’t start.

Problem

  • Your MK4 doesn’t detect USB storage or a simple USB accessory when you plug it into the factory USB port(s).

Symptoms

  • You get no popup, and no new source in the music or file browser.
  • The port charges your phone, but storage shows as “unknown” or empty.
  • It worked until you added a hub or a long extension.
  • You only see tiny drives, and large SSDs never appear.

Cause

  • You’re on an unsupported file system, for example an NTFS-only stick when the host expects FAT32 or exFAT.
  • If you’ve plugged in a power-hungry SSD or an unpowered hub, it browns out the port.
  • Pocket lint or dash dust is stopping the data pins mating, while the power pins still touch.
  • Your cable or adapter is charge-only.
  • Folder depth or file count is past what the media scanner handles, so you see an “empty” drive.

Fix Step-by-step

  1. Test a known small USB stick (≤32 GB) formatted exFAT or FAT32 with a few MP3s in the root folder, no hub.
  2. Blow out the port gently, then re-plug with the vehicle in ACC and the MK4 awake.
  3. Remove USB-C and Lightning phone cables, then retry the storage on its own.
  4. If you must use a hub, power it separately to the manufacturer spec. MK4 ports aren’t meant for multi-drive farms.
  5. Recreate the library with shallow folders and Latin filenames, and skip DRM oddities for the first proof.
  6. If you’ve copied firmware or files from an unknown PC, scan the stick for errors on a desktop.

Notes

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Still need help?Still stuck after these steps? Tell us what's happening and we'll suggest the next step. Tell us whether you can read the same stick on a PC, its capacity, its format (FAT32, exFAT or NTFS), and whether the port still charges your phone. Start a support ticket