A. Dumas wrote:
> Roby  wrote:
>> - what kind of HD did you use ? A 2.5" SATA3 with USB adapter ?
>> - brand, model, capacity ? WD ? Are all brands good ?
>> - the RPI3 USB port is not capable of powering HD, is it true ? The HD
>> must have its own power supply, right ?....or powered USB hub...
>
>
> I got a Seagate 1TB external 2.5" hdd for ¤50, usb-powered by the 3B+ Pi
> without problem, that's with the RPi official 2.5A adapter. WD is fine,
> too, I'm sure (or some will say better). You can set "max_usb_current=1" in
> /boot/config.txt to double the available power via usb, but that wasn't
> necessary for me.

Thanks @A.Dumas for the info
But from the site www.raspberrypi.org I read these RPI technical
specifications:
"The USB ports on a Raspberry Pi have a design loading of 100mA each -
sufficient to drive" low-power "devices such as mice and keyboards.
Devices such as WiFi adapters, USB hard drives, USB pen drives all
common much more current and "........." The maximum power the
Raspberry Pi can be used is 1 Amp. If you need to connect to the USB
device that will take the power requirements above 1 Amp, then you must
connect it to an externally-powered USB hub"

Did I misunderstand or did you connect your Seagate 1TB directly to one
of the RPI's USB ports ??
I don't understand your phrase: "usb-powered by the 3B + Pi
without problem"
What is '3B + Pi' ?  It is a USB-SATA adapter with independent external
power supply ?
Thank you

--
Roby

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