Which one to choose? I am about to encrypt my USB Stick using Truecrypt

Which one to choose? I am about to encrypt my USB Stick using Truecrypt

Which one to choose? I am about to encrypt my USB Stick using Truecrypt,
but I am prompted with these options, although I guess it's just the same
because I only have one USB stick attached and it only has 1 partition?
1.) Removable Disk 1: 1.8 GB
2.) \Device\Harddisk1\Partition1 F: 1.8 GB MY_USB
I encountered this in Volume Location (Select Device dialog box)
Thanks.