I don't want to hi-jack the user's thread, but I do think it is important to clarify permissions so as not to mis-lead new users.
A partition in its' simplest form is nothing more than two boundaries encompassing a given amount of space. When you format that partition for a specific file system you then gain the ability to mark files and folders placed in that file system with attributes determined by the capabilities of the file system in question.
If the mount point for the partition is created by root then it by default uses root's environment variables. If the mount point is created by a user the mount point uses the user's environment variables.
Mounting a blank formated partition to a user created mount point enables by default the user to own and read and write files and folders on the mounted partition. If the mount point is created by root then root owns and can read and write files and folders created through that mount point. You can mount the same partition to two different mount points, one created by root and another created by a user and both can access the partition through their respective mount points. The user can create, read, and write their folders/files but not the ones created through the root mount point unless root has specifically enabled it. As you can see, it can become complicated but quite flexible.
Once files or folders are created in the file system on our data partition the permissions remain as they were created unless root intentionally changes them. Mounting to another mount point with different permissions will only affect new files and folders created through that mount point.
I think of it as having a root dir in each directory, with the mount point pointing, symlink-like to the root dir of the partition.
I think this way of thinking about it will mis-lead you in the long run. There is no separate root directory associated with a partition. All the files and folders are a part of the / based upon the mount point or points into the / file system. There is only one file system in Linux. It is / and may be spread over any number of partitions, local and remote. By-the-way, symlinks don't have permissions. They just point to files or folders that do.