Roby wrote, on 27-03-2019 09:28:
> A. Dumas wrote:
>> 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.
>
> [...]
> 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 ?

Dude. I have:
1x RPi official power adapter, rated at 2.5 A.
1x RPi 3 model B+ (a.k.a. 3B+), see
https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/
1x Seagate "Backup Plus" 2.5in portable HDD, with a USB connection.

NOTHING MORE. NO SEPARATE POWER ADAPTER FOR THE HARD DISK. I wanted to
write bus-powered but thought usb-powered was clearer. I guess not :(

***Apparently*** the standard current available from the RPi3 usb ports
is enough for my hdd, and my guess is it's enough for most 2.5" portable
drives.

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