Fujitsu q552 missing GB's

I have notice that my q552 64gb has only has 41.4gb available, where is the rest? I tried searching the internet, but no luck. I only had it for 2 weeks and this has me stump. My other tablet has a 64gb ssd and it has 51.4 available. Is it using 10 or so gb's for to restore the tablet or is it just wasted space. Thanks

 

Here's a snapshot of my HD. Same sized primary partition.



There are 4 partitions. System restore/system reserved (probably restore associated)/main (41.4 here too)/"d" drive

16GB recovery partition!

 

Hasn't there been some conversation around here about removing the recovery partition completely and putting it on an external thrumbdrive, for that kind of emergency use only? 16GB is really big.