Adding external HDD to Raspberry Pi

[geoffrey mendelson]

On 12/17/2014 4:03 PM, Gabor Szabo wrote:
> I've got this one:
> http://www.dynamode.com/english/pages/product/Datacom%20Products/USB%20Products/USB-H40-A2-0.html
>
Is it plugged into the wall? If you don't use an external power source, 
it is in passive mode, which means the overhead of the hub, and all of 
the devices plugged into it can not be more than what the port supplies. 
I don't know what the Pi supplies, but the official standard is 500ma 
for USB 1 and 2.

If you plug it in, it will support the full 500ma (possibly more) to 
each device.

Since it is a 4 port hub, you want a 2000ma (2 ampere) supply.

Personally, I prefer the Apple 12 watt chargers as they really do supply 
slightly more than 2 amps without burning up. They are expensive, but 
IMHO worth it.

Geoff.

-- 
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.