nRF9160 DK mass storage device (MSD)

The interface MCU features a Mass Storage Device (MSD). This makes the Development Kit (DK) appear as an external drive on your computer.

This drive can be used for drag-and-drop programming. However, files cannot be stored on this drive. By copying a HEX file to the drive, the interface MCU will program the file to the device. The J-Link OB will program the target that is selected with the nRF52/nRF91 switch (SW10). For limitations on nRF52840 use, see nRF9160 DK board control.

Note:

Windows might try to defragment the MSD part of the interface MCU. If this happens, the interface MCU will disconnect and become unresponsive. To return to normal operation, the DK must be power cycled.
Your antivirus software might try to scan the MSD part of the interface MCU. Some antivirus programs trigger a false positive alert in one of the files and quarantine the unit. If this happens, the interface MCU will become unresponsive.
If your computer is set up to boot from USB, it can try to boot from the if the DK is connected during boot. This can be avoided by unplugging the DK before a computer restart or changing the boot sequence of the computer.

You can also disable the MSD of the kit by using the msddisable command in J-Link Commander. To enable, use the msdenable command. These commands take effect after a power cycle of the DK and stay this way until changed again.