I have recently replaced the hdd on my laptop with a 1TB disk I did a clean installation of Windows 10 and then installed Norton Security Software for protection purposes . After that I tried to shrink the single partition (which is shown to contain around 30 GB) to 200 GB so that I could set up a new partition of around 750 GB to hold all my data. However if I use the Windows shrink function or the EaseUS Shrink function I can only shrink partition C: to 466 GB. As there is only about 30 GB of data in the partition what is contained in the other 436 GB of storage that is stopping me from shrinking it any further. I would appreciate your advice.