Can I boot from USB on a lenovo G50-30 laptop?

Please, I'd like to know if the boot menu on a Lenovo G50-30 laptop includes an option to boot from any USB unit (flash drive, external DVD reader, external HD, you name it).

Also, how do you access the boot menu on this specific laptop?

See, I'm interested in buying a G50-30 Lenovo lap, but the problem is that this particular machine doesn't include a DVD-ROM unit (optical drive). So If I have any problems and need to reinstall Windows, I'll need to do it from an USB unit.

Yes ofcourse

Can I boot from SD on a Lenovo G40-70 laptop?
I had to change the harddick in my Lenovo G40-70. Now the computer does not access the SD card slot containing recovery media. "no bootable device". Only option given by Boot Manager is EFI Network 0 for IPv4, which is not successful. How can I re-install from SD slot?