I recently installed four 500GB HDDs and setup a RAID 5. After formatting, etc, I see what I expected: 1,430,812 MB.
Now... Here's the problem. The partition shows it's set to 1.4GB... but only shows a drive capacity of *one* drive. This goes for Disk Management as well: Disk 0: Basic; 1397.28GB; Online; NTFS; Capacity: 465.76 GB.
I completed a chkdsk /r, tried looking at the partition with other software (Acronis, Partition Magic, GParted), and they all show the same thing: a single partition covering the span of the drive, but only a capacity of 465.76 GB.