USBD_MSC Example Flash disk not detected by OS

[Constantin]

Hi, 

we tried the example from the NRF SDK (15.3) with the USBD_MSC. The logging looks good so far and we have a data micro USB connected to the nRF USB Plug of the dev board.

But it gets not recognized under Windows, macOSX, Linux.

Heres the log:

<info> app: Starting Prog
<info> app: Initializing disk 0 (QSPI)...
<info> app: Mounting volume...
<info> app:
Listing directory: /
0 40B18CCF.TXT
0 4BB5F646.TXT
0 5851F42D.TXT
0 0000181C.TXT
Entries count: 5
Creating random file: 5851f42d.txt ...done
<info> app: USBD MSC example started.
<info> app: USB power detected
<info> app: Un-initializing disk 0 (QSPI)...
<info> app: USB ready

[Kenneth]

It enumerates and seems to work here:

What nRF52840-DK and version are you using?

[Constantin]

Where can I read it? The SDK is 15.3.

[Kenneth]

The physical hardware (DK) from Nordic.

[Constantin]

The boards name is nRF52840-Preview-DK.

[Kenneth]

This is an old "preview" board with an early engineering samples (early silicon with missing features, issues and not gone through proper production test and qualification. The "preview" is no longer recommended for development. Please order a new nRF52840-DK.