My disk at half size after formatting

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http://superuser.com – I'm a long time linux user, I'm also a Windows user, after formatting my brand new USB dongle I get ~30Gb from the partition table available to create a new partition where the nominal capacity of the USB pen i 64Gb. I tried with the Windows 8 utility diskpart using both convert gpt and convert mbr, I used diskmgmt.msc too, I also tried fdisk, cfdisk, gdisk and gparted on linux, the result is always the same with ~30Gb free and I can't see any figure bigger than that . What just happened to my disk ? I just tried to format my USB to NTFS under Windows and from there I got this and I have no (HowTos)