A minor point for future clarity: Little b means bits. Big B means bytes.
When people write Mb (whether 11 or 12 for USB) they mean mega-bits. "My scanner, attached to my computer using a USB 11Mb/s interface (or is it 12Mb/s? I can never remember which) has such low resolution that a full-frame scan of a 35mm negative is only 10MB in size." -- USB is the only popular interface that is a practical limit to scan rates. Many scanner transports seem to run at about 1-2MB/s, some maybe as high as 5 MB/s. So the interface deserves performance consideration. If you tend to multitask (on a personal level) USB gets dreadful when trying any combination of unloading a memory card, scanning and/or printing. Wire
