Determine what was last modified

Hello,

Let me try to explain the scenario of my problem to help you better understand it.

So, I've a partition on the server (D:\old) on my server which use to have all kind of stuff.
To name a few, we had folders for roaming profiles, SharePoint database, accounting information for quickbooks etc. Before some time ago, all those things were copied to a new drive and we started using them and discontinued using D:\old but we had it there just in case. Now I want to completely remove all the data there and use it for something else. But when I go into some folders, some of the files are modified recently in this month.

I want to know what exactly changed in this files and folders so I'm not missing anything important. I dont want to take any chances. I dont want to wipe off the partition and then figure out that it was using DB for SharePoint from here. So I need some suggestions on how should I proceed with this.
 

Thank you
Smary