Transcend JetFlash User Manual page 18

b. After the completion of format, you need to re-plug JetFlash to enable
the setting. Restart your computer and press the Delete key (or
whatever key combination is correct for your computer) during boot-up
to enter Setup (CMOS Setup Utility) to reconfigure BIOS.
c. Within the Advanced BIOS Features menu, change First Boot Device
to USB-HDD. Save & Exit Setup. Then at SAVE to CMOS and EXIT
(Y/N)? Type Y and press Enter.
d. Now, your system can boot from JetFlash. During boot up, JetFlash
will be assigned drive letter C (C: \ > appears on the screen). If your
computer has a hard Drive, it will be assigned drive letter D.
e. You can see boot up files in Removable Disk. Please don't delete or
move any of these files or boot up function will fail.
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