nrf52840 usb_msc demo windos10 Home Edition USB disk will be lost in about 20 minutes

[Mars_xu]

I used usb_msc with nRF5SDK160098a08e2 sdk to connect the usb of pca10056 development board to win10 home version and the disk could not be recognized after about 20 minutes;

1. Current test conclusion:

 1) Appears only in win10 home edition, not in win10 professional edition;
 2) Use the Debug mode, the optimization level is set to None, the disk is displayed for 20 minutes after mounting, and the disk is not lost. When entering the secondary folder to write the file, the file cannot be written, and finally the disk is lost;

2. Test procedures

nRF5SDK160098a08e2-new-2.rar

3. Problem phenomenon
1) When the USB is connected to the computer

2) The disk is lost in about 20 minutes

4. Test method
1) Burn the compiled program
2) USB connection to win10 home version computer
2) Create TEST1/TEST2/test.txt

   
3) Write the current time in the test.txt file every 10 minutes;
4) After a few times you will find that the file cannot be written;
5) The disk has been lost;

5. The compiled hex file is convenient for you to quickly reproduce the problem;

 2425.usbd_msc_pca10056.hex

[ketiljo]

Can it be that the  USB port power is turned off after a while? There shouldn't be any difference in how Windows handles a USB drive across Windows versions. Check in Device Manager: 

[Mars_xu]

1. Test conclusion

1) I turn off the power saving option of USB hub power tube of win10 home version, and the test will still appear;

2. Other information:

1) The windows 10 home version is connected to the MCU of other four manufacturers without disk loss;

2) It can be determined that there is a difference between win10 home edition and win10 professional edition. Previously, we used MCU from other manufacturers to encounter disk loss in win10 home edition, which was finally solved by upgrading SDK;

3. Personal suggestions:

1) You find a win10 home computer, which is very easy to reproduce;

[Edvin]

Hello,

Can you please try the following guide to turn off the power saving mode? It is a bit more steps than only the device manager:

https://www.hamoperator.com/Fusion/FusionFiles/K9EQ-Fusion-PDF-0023.pdf

If that doesn't work. Can you please check if the log says anything when you try to open the folder, and the disk disconnects?

BR,

Edvin

[Mars_xu]

Hi Edvin,

1. I have turned off two USB power management according to the tutorial you provided, and the phenomenon still appears after testing;

2. The latest test conclusion:
1). Win10 Home Edition has disk loss on 1903 and 1803 versions;

2). The system version number where the disk is missing
1> Version number: 1903, operating system version: 18362.836
2> Version number: 1803, operating system version: 17134.765

3). The system version number without disk loss
1> Version number: 1809, operating system version: 17763.1282
1> Version number: 1809, operating system version: 17763.1217

3. Test process description
1) Test equipment: 6 win10 home computers;
2) 3 sets have disk loss, 2 sets have version number 1903, 1 set has 1803;
3) 3 sets have no disk loss, 2 sets have version number 1809, 1 set has 1909;

4. The problem of disk loss, we have passed detailed tests, the phenomenon has been very clear
Must appear on version 1903 and 1803 systems, I hope you can understand the true status of the problem,
Now that the small batch of products has been completed, we will take the next step according to your problem analysis;

[Edvin]

Hello,

The issue is that we don't have any win10 home edition computers to test with. 

I understand that this is an issue.

Can you please check the log messages from the nRF device at the point when it disconnects? Does it say anything? Do you receive any events at all?