Other Non-system disk

Can anyone tell me why I am unable to boot from this USB stick which is not partitioned?

file -s /dev/da0
[0/3]
/dev/da0: DOS/MBR boot sector, code offset 0x3c+2, OEM-ID "*P%5!IHC" cached by Windows 9M, sectors/cluster 2, root entries 112, sectors 1440 (volumes <=32 MB), sectors/FAT 3, sectors/track 18, serial number 0x124b0cf8, label: "DISK 1", FAT (12 bit), followed by FAT

Automount mounts the device and shows me what is on it.
 
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