How does USB bandwidth work? Will multiple devices share the 480mbps limit for USB 2.0?

If multiple USB 2.0 devices are connected to a computer, will they share the 480 mbps theoretical bandwidth? Say I have 6 external hard drives configured in RAID 0, all plugged in to my computer via 6 USB 2.0 ports, will the read/write speed be capped at 60 MB/s?