Users mostly face this kind of issue when there is a problem within the drive, or any virused in the system. For getting rid off this trouble, you can follow the methods that are given below:
You should scan your device and check if is there any malware attack on your system.
You can try formatting the drive
Disabling write protection is also one of the option.
Read more: https://allinsider.net/windows-was-unable-to-complete-the-format/
To log into Mymercy users must sign up for an account and enter some basic details such as the name of their doctor, postal address and contact information.
https://mymercys.com/