As folk began to demand their files are saved when we restore the OS, many makers did this so copies could be in that other partition while the OS is restored. Works most of the time.
To change this you use Dell's advice on the matter or tools like GPARTED to resize as you see fit.
Keep in mind XP and some OSes have strange issues at say 127GB so be sure you know your OS limitations.
Bob
My wife got a new computer and I got her hand-me-down. I have noticed that the OS is in the 58.5 GB partition and the Data section, which seems to be unused has 229 GB of unused space. We have had this laptop for roughly since 2010. I thought that the space allocation was supposed to be the other way around.
Does anyone have suggestions as to how I can fix this?

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