SanDisk Ultra Dual USB 3.0 32GB and 64GB Reformatted to NTFS for Windows 10 Recovery

I have an HP Stream 8 tablet that I upgraded to Windows 10. 
Thought it would be wise to create recovery media and went out and bought a pair of these dual drives.
Recovery creation software wanted them re-formatted in NTFS.
32GB ended up around 28GB (not too surprising), but 64GB ended up at about 32GB (very surprising).
I know NTFS is not recommended for USB (they were exFAT), but should I be concerned about this?

After creating the media, it appears I only needed 1GB (without files) and 3GB (with files) - so I may re-purpose them.

Is there anything special about recovery media - can I just copy it to a lower capacity USB stick?
If I reformat the USB sticks, will I get the capacity back? 
Does it matter if it’s Windows 7, 10, 32-bit or 64-bit?

Thanks.

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I HAD THE SAME PROBLEM.HERE İS HOW I SOLVED : YOU JUST DOWNLOAD “HP USB Disk Storage Format Tool” AND FORMAT YOUR USB.SİMPLE.