I installed Windows 10 Pro on a RAID 0 of 4x512 GB Samsung 850 Pro SSD using the built in Intel controller on a Gigabyte GA-Z170X-Gaming 7. The Performance is great & everything seems to work perfectly. The only issue is HD Properties is showing 536 GB is used out of 1.86 TB while File Properties including Hidden & System files showing Size on disk 304 GB. almost 232 GB of an accounted disk space. notice Hypernate is disabled "Powercfg /H Off" & No page nor swap files. I also enabled viewing hidden & system files in explorer. Any suggestion
Data get chopped up and stored on the disks in clusters. A cluster can only be part of 1 file, so if a file is say 17kb, and a cluster is 4kb, then 5 clusters would be used ... 4 fully, 1 with 1k used and 3k "wasted". So the size of the file may be 17kb, but the size of disk used is 20kb .... consider all the files on your system ... you lose a lot of space. In addition the is all sorts of other stuff on the disk such as NTFS data, directory listing etc. all that eats some space. not all of the data on the disk is the file contents.
Start doing a chkdsk /f c: (from an adminstrator prompt) free space marked as used is likely the most common (and usually unharmful) disk error.
Thanks for your reply, I understand this that is why I referred to "Size on Disk" not "Size". Also this happened only recently.