In message <sis1fu$htm$
1...@dont-email.me>
Mike Scott <usen...@scottsonline.org.uk.invalid> wrote:
> I've now had it running happily off either sdcard or booting from HD.
> But I've hit another annoyance.
>
> Basically, it won't run with two USB HDs attached. If I boot off sdcard,
> then plug in the disks, the first is fine: the second produces a stack of
> errors then crashes.
>
> Messages start with da0: .... destroyed then it detaches the keyboard and
> mouse, then I get usbd_req_re_enumerate: .... USB_ERR_IOERROR, ignored
>
> and it's power cycle time. Ouch!
>
> Anyone had two HD's working in at once?
>
> The PSU is the rpi 15W standard issue, btw. Could that be an issue though?
It's pretty much certain.
I do have a RasPi with two HDDs attached, but to make that work I had to
get a very powerful PSU (mine's rated at 8 amps, which is more than enough,
but it was not expensive), and, crucially, I had to jumper the main 5V
line to the USB power pins so as to avoid the current limiting circuitry
asspciated with USB within the Pi. This has my setup relying on the PSU's
current limiting.
Don't do this unless you know what you're doing.
The other advice, getting a powered USB hub, is wise.
This may be jumping ahead a bit; but, if you get a hub and want to run
both the Pi and the hub off the same PSU, beware of cheap power splitters
that don't have enough copper in them and thus drop too much voltage.
David