2. Select View on the top bar and select Options on the right.
3. Make sure the "Show hidden files, folders and drives" options is selected
4. Click OK
Now search for large files:
1. Click on the I: drive
2. Select a group of folders, right click, and select properties
3. Wait for space to be calculated
If these files seem to be taking up a disproportionate amount of space, search through these files using the same method above until you have pinpointed the source off the excess disk use.
If the large file is not in that set of folders, select a new group of folders and repeat the method above.