I have an external hard drive that I use for just about everything, but it would appear since I replaced my laptop and/or upgraded to Windows 10 last month I can't add anything to the drive anymore. I can read and copy just fine, but it says I need permission to create a folder or add files to the drive. I've been in the permissions and my admin account is the owner and I have full permissions for the drive yet it keeps saying I need them do anything. I've looked at Microsoft's help pages, but they're all Windows 7 advice. I suppose I could copy everything, format the drive, and put everything back, but that's a few hours of work. Any ideas?