linuxaudio.org

On Sun, May 1, 2011 at 8:33 AM, Arnold Krille  wrote:

quoted text
> On Saturday 30 April 2011 23:33:24 Mark Knecht wrote:

>> 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).

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.
> Actually most laptops tend to supply more then the max of the spec. The reason

quoted text
> 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

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