Most likely it is just a partitioning problem.
First try using windows Disk manager to show partitions and to delete/repartition and reformat the usb drive.
Unfortanutly this may not work and you will need
A) a third partitioning disk utility, or
B) What I use. use windows cmd line diskpart cmd to remove it (what I had to do for a thumbdrive used on a Mac)
.. If diskpart is what you want to use, be cautious and make SURE it is pointing to the USB drive.
Basically (read this first):
http://technet.microsoft.com/en-us/library/cc766465(v=ws.10).aspx
.. You open a dos command window WITH run with admistrator privlage. then type the following cmds.
-
Diskpart Starts program Do Not type the - (ie diskpart> List disk then enter key)
-
LIST DISK (shows all disk, look for Disk Number of the Drive (Your USB drive)
-
SELECT DISK X (For X insert USB drive Number)
-
DETAIL DISK (Detailed information of the disk that has the focus This will show if you have selected the correct drive.)
-
CLEAN (One of the most practical and most dangerous: it removes at once all the partitions on the selected disk.)
Note for the next two do NOT use the size=n)
-
CREATE PARTITION EXTENDED (Creates an extended partition on the current drive. After the partition has been created, the focus automatically shifts to the new partition.)
-
CREATE PARTITION LOGICAL (Creates a logical drive in the extended partition. After the partition has been created, the focus automatically shifts to the new logical drive.)
-
EXIT (Quits DISKPART and returns to the command prompt classic)
You should now be able to format the drive (WITH the correct space) using windows
Ref http://forums.techarena.in/guides-tutorials/1172499.htm