Fred Smith wrote:
> On 2019-01-08, A  Dumas wrote:
>> Simply get any 2.5" portable disk. It won't need external power. Make sure
>> you use the official RPi power adapter for the Pi, though.
>
> Even then I'd be using an externally, separately powered disk. The
> pi simply does not have the grunt to run "any 2.5" portable disk"
> reliably. You are asking for all sorts of obscure problems that
> will ruin your day.

All modern 2.5" portable disks say they require no external power, that
means they adhere to the common denominator usb2 standard of 5 V and max.
500 mA. The Pi does too, it can even go to 1 A with the right setting in
/boot/config.txt. So, any 2.5" portable disk will do. I have 3 different
ones and they all work fine without the 1 A setting.

... There *might* be 2.5" disks who draw more than 1 A peak current at
startup. Those are almost certainly not disks you can buy in the shops
today.

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