Re: [ARMini-support] External SSD via USB
- From: A Rawnsley <rcomp@xxxxxxxxxxx>
- To: armini-support@xxxxxxxxxxxxx
- Date: Fri, 13 Nov 2020 13:46:32 GMT
In message <bc6cc7ce58.boase@xxxxxxxxxxxxxxxxx>
Bernard Boase <b.boase@xxxxxxx> wrote:
On 6-Oct-2020 in csa.misc, Tim Hill described adding a SATA SSD to a Pi
3B+ via a USB adapter, so I bought the same items and successfully
formatted the SSD for RISC OS with HForm.
The disc is readable and writable also on Iyonix under OS 5.28, but the
ARMX6 hangs completely if the disc's USB cable is inserted whether before
or after a fresh boot.
It would be nice to have the flexibility of using this SSD attached to the
ARMX6 as well as to the other machines. What might the problem be?
Most likely power related. If the disc only has a single cable, it is
probably drawing too much power for a single USB 2 port. Many of the
older USB 2 adapters had two cables - one for data+power and the other for
power.
You could try using a powered hub, or ideally a USB3 hub. These offer
more power per port, which generally stabilises USB issues.
Also, check that your ARMX6 internal hubs have power - they have plugs
going into them from the main PSU on the side, and sometimes these plugs
come out. In this case, the hubs will then be powered by the motherboard,
which limits how much power can be delivered.
Finally, you may find that different ports give different results, as the
two internal hubs are connected to two different USB ports on the
motherboard.
Finally finally (!) be aware that USB-conncted SSDs will generally be a
lot slower than SATA connected ones, due to limitations and overheads of
how USB 2.0 works. Iris, for example, takes 8 seconds off an internal
drive, but up to 30 from a USB drive.
It is why I am concerned about some Pi-based products championing the use
of USB connected SSDs etc. Users could well be in for something of an
anti-climax when they realise it can be slower than an SD card. Note, 4te
works around this, and can load Iris in about 4 seconds thanks to its
accelerator tech.
Andrew
--
R-Comp
22 Robert Moffat, High Legh, Knutsford, Cheshire WA16 6PS
Tel: 01925 755043 Fax: 01925 757377
http://www.rcomp.co.uk
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