What file format did you use? FAT 16? That format just can't work with more than about 16 Mb and, in this case, use about 1.2 Mb for the FAT and root folder.
Reformat using FAT 32. That format CAN work with something like 250 Gig and more.
Anyway, the total AVAILABLE space will NEVER be the total capacity as some of it is always used for the FAT table and the root folder.
Electro, December 2011