1 May
2011
1 May
'11
7:49 p.m.
On Sun, May 1, 2011 at 8:33 AM, Arnold Krille <arnold(a)arnoldarts.de> wrote:
On Saturday 30 April 2011 23:33:24 Mark Knecht wrote:
I'm not saying they don't supply power. I'm only saying I don't know if
they do.
If it turned out they didn't, for whatever reason, then the purchase
of a bus-power only audio device would be a disappointment.
One other consideration is device power. This
will be hooked to a
laptop and I'm not sure my laptop supplies SUB bus power.
Additionally, I don't know how to test that myself. It seems from
looking at the Roland site that there isn't a power connector on the
UA25 so it's possible it wouldn't work, or maybe would require some
sort of a USB hub that can supply power.
If your laptop has standard-conforming usb-ports, they will provide the power
needed (and spec'ed in the standard). Actually most laptops tend to supply more then the max
of the spec. The reason
behind this is that many external hdds need more then standard power and thus
use two connectors. But on laptops both of these would be on the same power-
supply anyway and physical ports are notoriously short. So they provide more
power and make most hdds happy when connected with just one connector.
Have fun,
Arnold
In both Gentoo and Win 7 I have hooked up all 4 external USB hard
drives that I own to the ports and none of them worked. Using your
info about power that implies that none of these drives can be powered
from the bus.
As an interesting point, this machine (Asus G73JW) also has a USB 3.0
port which is supposedly capable of replacing eSATA one of these days.
- Mark