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Connecting a USB mass storage device

I have a PNA device that connects to a computer via the USB by exposing its internal flash as a mass storage device.


Ever since the Mojave 10.14.4 upgrade the MacBook does not mount the mass storage drive, unless I follow these steps:

  1. Disconnect all USB devices and disable Bluetooth
  2. Reboot the computer
  3. Connect the PNA

if I disconnect and connect the device a second time, the drive is not mounted. If there are any USB devices present at boot or Bluetooth enabled the mass storage drive will not be mounted.


I've tried all possible guides on the internet about fixing the USB connection problems to no avail. The weird thing is that the PNA connects without problems on an older machine with macOS 10.11.5 with the same cable.


Does anyone have any idea how to fix this?

MacBook Pro Retina

Posted on Jul 30, 2019 2:44 AM

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Connecting a USB mass storage device

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