Your Little Big Disk if originally in the factory settings is 1000MB or 1TB.
It is showing as one large 1000MB volume (J:) with 953GB available to you (formatted size is always less than physical size due to formatting, and whether counting 1MB as 1024 or 1000). In your benchmark it is numbered (5)
The other drive is also named 1000MB volume, but this is only a name, and it is identified in your system as (F:) drive letter, but much smaller is size - 149GB. It is also numbered the same (5)
I don't know why you are seeing this smaller disk unless you also have a 2nd drive connected. Do you also have anything else connected? USB perhaps, and for some reason you are measuring two different disks as you have two different drive letters?
First volume is likely your Little Big Disk. Great performance. Percentage indicated is how full the drive is. It shows 19% of your 1TB disk is occupied with files and folders.
2nd picture is of another volume, showing that it is almost empty. with less than 1% occupied.
In any case, confirm all is OK under OS X first, then proceed with your tests using Boot Camp.
As the other writer noted, MacDrive Pro is a driver installed under Windows that permits read/write access to Mac formatted drives. MacDrive and MacDrive Pro are quite similar. MacDrive Pro adds capability to mount and use RAID-0/RAID-1 volumes created with Disk Utility.