kgordon420 at gmail.com
Sun Oct 7 15:32:38 EDT 2012
On Sun, Oct 7, 2012 at 3:11 PM, Mikus Grinbergs <mikus at bga.com> wrote:
> Since I don't own a cell phone, I've never tried charging from an XO.
> My external USB storage devices are all self-powered; and my other USB
> devices (adapters, microscopes, keyboards, etc.) are all low-power devices.
> In about four years of using XO-1.5s, I haven't ever had the XO-1.5 crash
> when I dynamically plugged any USB device in.
I experienced this a couple of years ago in SF when doing my myriad of
gadget tests, Hence, the reason I bought my powered USB hub is that I
(more than once) plugged in an external USB powered USB mini CD drive and
the 1.5 screen went slowly all weird then white. If I remember, I was
informed that anything that draws more than 500mA kinda breaks USB rules-
and that would include iPhones and iPads. Using a double dongle tries to
kluge it on PC's, but this doesn't have any better effect on the 1.5 -
something to do with power flowing downhill. I think I was also told that
it doesn't happen on the XO 1 because of the presence of some diode or
sumpin that keeps the USB device from draining out too fast.
Since I now (like Mikus) use powered hubs for anything that needs more than
500mA of power, I have forgotten the exact explanation.
I believe it was Richard who explained it to me, and basically told me to
cease and desist at the risk of doing damage to the 1.5. Perhaps he can
chime in again on this.
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