LED Monitor

Huge difference in ‘Size on Disk’ and ‘Used Space’. In my E drive, total space is 410GiB. Size on Disk is 85 GiB. Used Space is 385 GiB. Free Space is 25 GiB :o Windows 10 1803. WD Blue 2TB HDD. There are no hidden or system files that can be seen like pagefile, hiberfile etc. But no idea...