Hello,
At 17:08 22/04/2013, you wrote:
>On 2013-04-22 13:00,
><mailto:hampshire-request@mailman.lug.org.uk>hampshire-request@???
>wrote:
>
>On 21 April 2013 17:34, Peter B.
><<mailto:petyrb@gmail.com>petyrb@???> 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.
Is this the same for e-SATA?
(high CPU load)
That will probably the way i will go when i can
find a 4 bay dock for a reasonable price.
Martin N
Those who would give up essential Liberty, to
purchase a little temporary Safety, deserve neither Liberty nor Safety.
Benjamin Franklin (170690)
--
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