USB3 HDD not detected

Issue: USB3 HDD not detected / not working


  1. HDD does not show up in block info
  2. HDD does not show up in /dev/sd*
  3. USB3 HDD works fine on other devices (e.g. PC, Laptop, ...)
  4. USB2 drives are working fine


  1. Does the USB3 HDD show up in lsusb and lsusb -t?
  2. Does it show up in ls -l /dev/sd*?
  3. Does logread yield any helpful information related to USB when you connect/disconnect the HDD?
  4. Does a different USB3 HDD (different manufacturer or different model) work correctly?
  5. Do you have all required USB related kmods installed? → Check with opkg list-installed | grep usb
  6. Do you have all required filesystem kmods installed? → Check with opkg list-installed | grep kmod-fs-

Root causes:

  1. kmod-usb-storage-uas not installed
  2. specific USB controller problems (e.g. JMicron JMS561U, JMS578, ...)
  3. The XHCI driver for MT7621 is incompatible for UAS in USB 3.0


  1. install kmod-usb-storage-uasopkg update && opkg install kmod-usb-storage-uas
  2. remove kmod-usb-storage-uas (=fallback to USB2, if acceptable and nothing else works)
  3. Use a different USB3 HDD (different Manufacturer or different model)
  4. Use quirks

Further reading:

Forum links:

  • ...
This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.More information about cookies
  • Last modified: 2019/10/27 11:31
  • by tmomas