On 2013-04-22 13:00, hampshire-request@??? wrote:
On 21 April 2013 17:34, Peter B. <petyrb@???
<
mailto:petyrb@gmail.com>> wrote:
As far as I know usb 2.0 maxes out at 30mbps usb 3.0 100mbps for
local data transfer.
I think you're confusing things here. USB2 runs at up to 480Mbps raw
line speed, and USB3 runs at up to 5Gbps.
--
Daniel Llewellyn
That's as maybe. However USB relies upon a whole heap of CPU Processing
to move anything. This is done do keep the costs down. Firewire on the
otherhand does DMA and uses a whole lot less CPU.
As someone who wrote their first Device Driver before Microsoft existed
(for a PDP-11/45 in 1976) Serial I/O using devices such as a UART is
really-sllooowwww. DMA is much faster and neater. Sadly in these X86
times there are lots of devices that do I/O character by character or
byte-by-byte and not using DMA.
Getting the quoted max speeds for USB is very much 'pie-in-the-sky'.
As others have said, I'd use the LAN to mode data to/from my NAS. The
USB connection is much slower than the LAN.
Stephen D
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