multi-boot

is there any way i can create a USB which can mount ISO form other disks/partitions as bootable devices. i mean like the usb itself has no os and you can just copy any iso of a certain OS into another partition (on same usb) or another disk. and when the usb is booted, its show a bootloader that...

hi why is http://www.webhallen.com/se-sv/datorkomponenter/219705-gskill_ripjaws_4_64gb-2400mhz-ddr4-cl15-f4-2400c15q2-64grk more expensive than http://www.webhallen.com/se-sv/datorkomponenter/219698-gskill_ripjaws_4_64gb-2800mhz-ddr4-cl15-f4-2800c15q2-64grk ? 1st is £700sih and 2nd...