disk manager or diskpart. it probably needs to be mounted first to show in file explorer
How do I mount it? Beginner at this!
It's probably in ext4 file system from that nas software. you need to get it to NTFS for windows. just google how.
Googled info seems to assume I get an option to "format" when I right click. I don't!
The only options on offer when I right click the partitions in Disk Management are "Delete volume". Do I need to delete all 3 existing volumes/partitions in order to reset the drive so I can re-format it?