Dear Microsoft Expert,
I have Windows 2008 R2 server, it is a member domain, i have one Logical Disk, the driver letter is O: the capacity of this disk is 3.51 TB
I check manually the data on this Disk around 348G
But on the explorer only free 427G, i checked and found nothing data that make the disk almost full
Attachments are captures our disk


How can i find the data that make our disk almost full