I use two external Western Digital HDD disks (M & N) as part of my back up routine.

Disk Write Protection in Windows 10 keeps re-setting-readonly.jpg

Almost every time I try and run backups now, I get an error message telling me that Disk N is read only. I'm quite happy resetting this using Diskpart, and it works every time.

However, I'd like to find out why it keeps re-setting (and why N is always the one to re-set, but M has never done this.)

I've tried searching but got plenty of hits on how to resolve it but not on how to stop it happening. Can anyon etell me what causes this.