- Registration date
- Wednesday October 8, 2008
- Last seen
- June 15, 2019
The Disk drive manufacturer uses a decimal numbering system and lists the disk size BEFORE formatting.
Microsoft uses a hexadecimal numbering system (a mega-byte is 1024 decimal bytes in this system) and Windows lists the size AFTER formatting.
So, Windows always shows less space on the hard drive than what is printed on the hard drive. You don't have any lost space. It's just how things work.