USB booting :: difference between usb-zip and usb-hdd

what's the difference? and which one do i want to use for my usb pendrive?

correct me if i'm wrong anybody, but I think the ZIP is the USBKEY and the HDD is actualy a USB HARD DRIVE. Like one inside your computer only its external and connects via USB.

It really depends on what your computer BIOS supports.
Many older computers may only support boot from USBZIP while the newer one seem to offer USBHDD. Either way the bootfloppy-usb should be able to boot if your BIOS does not support either method. The USBHDD would be preferred as it can be a single partition.

original here.