4 Answers Sorted by: 19 First of all, USB means Universal Serial Bus. It is a standard for a control and data bus, just like PCIe, PCI, EISA and ISA are all buses. USB is not a device, like a CD or DVD drive. (Optical drives typically use SATA or IDE buses with the ATA protocol.)
USB-FDD "Unsupported" In summary: Generally speaking, if your system BIOS supports the USB-HDD boot option, it should boot Linux from a large capacity USB flash drive. (a BIOS that supports USB-HDD automatically detects the geometry of the USB Flash drive)
LGws0Fu.
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