64GB Flash Voyager Slider only showing 57.66GB

My Flash Voyager Slider USB 3.0 64GB USB Drive is only showing 57.66GB in the Windows 8.1 Disk Management console, and 57GB in DISKPART.



I have used DISKPART to delete all partitions and re-create a maximum size partition, and then formatted NTFS, but no change.



Is this correct?



Thanks