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SanDisk Extreme USB 3.0 - 64 GB

I have Windows 8.1 installed on Sony Vaio.

It prompted me to created  a recovery media on any drive.

I created a recovery media on SanDisk Extreme USB 3.0 - 64 GB USB drive.

After the creation of recovery media it shows total space as  31.9 GB out of total of 64GB on my pen drive and renamed the drive as RECOVERYUFD. Please see the screen shot.

Please advise how can i recover full 64 GB back on my pen drive and what happened to the extra drive capacity.
SanDisk.png
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Kimputer

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I formatted the pen drive it is again showing 32 GB instead of 64GB total capacity.
Formating.png
Formatting2.png
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I downloaded: WinSetupFromUSB-1-6-beta2.exe and formatted the SanDisk 64 GB pen drive.
After formtting, i see capacity as  64,001,638,400 bytes which is around 64 GB however, windows is calculating it as 59.6GB. Why?

What's gone wroing with the extra diskspace of 4 GB.
USBFormat.png
The OS always sees less than what the manufacturers advertise. For example 1KB is actually 1024B, and for the manufacturer it is 1000B, and 1GB is actually 1024KB, and not the 1000KB the  manufacturer says. They just use different measurements for their calculations.
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Awsome!. Thanks for your help