Drives never have as much available space as they claim. Also, filesystem overhead (room for various journal metadata) will eat some space off the top.
One thing you can fix - EXT4 by default reserves 5% of drive space for critical daemon functions on a root file system. This will reveal how much is reserved (in blocks):
sudo tune2fs -l /dev/sdb1 | grep 'Reserved block count'
If you aren't installing an OS to this drive, you can make all this space available with:
sudo tune2fs -m 0 /dev/sdb1
Warning: Of course, use the device name of your drive in place of sdb1.
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