During the creation of a new disk, the error “The media is write protected” pops up.

Check if the disk (or volume) is in a read-only state:

DISKPART> attributes disk
Current Read-only State : Yes
Read-only : Yes
Boot Disk : No
Pagefile Disk : No
Hibernation File Disk : No
Crashdump Disk : No
Clustered Disk : No

If the disk or volume is in a read-only state, clear the attribute with the following command:

attributes disk clear readonly

attributes volume clear readonly

Go ahead with the creation of the new disk