This is a great question. So the trick here is that uninstalling R / RStudio will not necessarily remove the .RData files. The easiest way to find them depends on your operating system. On a linux operating system (and Mac, for that matter), the files can be hidden. As a result, the easiest way to find them is by listing the directory using something like ls -a (which shows all objects).
The usual culprits:
- $HOME or your home directory
/home/myusername on linux
- The project directory that you were most recently working in
There are other ways to find big .RData files for removing them, but it would be helpful to know what operating system you are on and what type of the RStudio IDE are you using? Desktop? Server?