Even though you may be logging in with same user name on SSD, Win 10 still sees you as a new user. You just need to take ownership of the folder on the hdd
http://winaero.com/blog/how-to-take-ownership-and-get-full-access-to-files-and-folders-in-windows-10/ - don't download anything and don't use this command on the root of C drive. Some folders you don't want to take ownership of as windows may not function afterwards. Document folders are fairly safe though.