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)
What is the difference between USB CD and USB FDD? Only the option that includes the word “USB” is a USB option. FDD is a floppy disc drive, CD ROM is a CD drive, and HDD is a hard drive. How do I boot from USB FDD? Go into the BIOS, and go to the page that determines the boot order.
Then, there is the actual bootloader itself, i.e. the first bit of code that executes when a computer boots from USB. Unfortunately, HDD/USB and ISO bootloaders are very different beasts, and the BIOS or UEFI firmware also treat USB and optical media very differently during boot.
You would need to get the flash drive formmatted as a floppy again (FDD) or try selecting that option in the BIOS. Note that most current computers don't use the "USB ###" type options (FDD, HDD, ZIP, etc.). Instead, they recongize the flash drive as a hard drive device.
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usb cd vs usb fdd