Commonly, a USB flash drive is utilized for storing, transferring and backing up data like personal files, software, media files, etc. But users might not have much knowledge about its other hidden characteristics. It could also act as a replacement of CD/hard disk/DVD media as OSs handler resources and as a plug and play portable system. However, security is a major concern for external boot system and to fix this issue, numerous solutions were proposed and implemented. Out of all the existing security provisioning schemes, biometric based security solutions are always reliable and hassle free to process. The USB drives now available with fingerprint protection and to come out of the box, this article secures the USB drives with the combination of fingerprint and finger vein. On successful authentication, the user can boot OS from USB. The performance of the work is analysed in terms of FAR, FRR, accuracy and time consumption rates and observed that it achieves greater accuracy rate when compared with other classifiers.