On 2019-01-09, druck  wrote:
> On 08/01/2019 07:18, 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.
>
> I don't know why you would even consider a conventional disc with a
> Raspberry Pi, they are power hungry and slower than SD cards for small
> random access transfers, due to latency.
>
> On the other hand an SSD has great random access performance, and has no
> power issues. It's not even like its expensive - a band new SanDisk
> 120GB SSD can be had for ??20, which is only a couple a quid more than a
> SanDisk 128GB SD card.
>

Because the i/o throughput of the rpi SD card interface is worse than that
of a USB attached hard drive. The read throughput is 50% better, not done
a write test, but suspect SD card will performa even worse. Of course the
best answer is a USB attached SSD. An other reason is for capacity. I have
an RPI backup server with a 2Tb USB HDD for doing network backups of other
stuff.

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