Discussion

Connecting USB3 harddrive to banana pro

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Hi !

First post here ! ... and probably a beginner question :

How to connect my external USB 3 hard drive to my newly bought Banana Pro ?

If I connect to the USB 2 ports, it's going to be bottlenecked by the USB 2 ports.
Can I find a esata to usb3 converter ? Are the fast enough compared to the SATA 2 specs ?

Sorry if that sounds too dumb ... I just hope to build a NAS with open media vault and I would like to get the most out of my banana ;)

Thanks a lot for whom can help me !
The external hard drive I bought is a toshiba canvio 3To.

I found a couple of disassembly guidelines hoping that I could connect it with a SATA cable (SATA + dedicated power supply) :
http://goughlui.com/2013/10/01/h ... xternal-hard-drive/
http://www.gearhack.com/myink/Vi ... d+Drive+Disassembly

The hard drive inside is a Hitachi ... but the connector looks more like a multi-pin connector rather than a SATA connector.

Any advise ?

hawhill  
At least in the pictures of the 1st link you gave, there's a proper SATA connector visible on the adapter board.

Hi Hawhill. Thanks for your repply !

I'm guessing you are talking about this photo :
http://cdn2.goughlui.com/wp-content/uploads/2013/10/IMG_5522.jpg

... from what I know this is a USB3 connector.

In case you are talking about that photo (actually the part on the top-right of the photo) :
http://cdn1.goughlui.com/wp-content/uploads/2013/10/IMG_5528.jpg

Then, how do I go from the connector on the hard drive to the connector on the banana pro ? Because to me, my usual sata cables dont have such large connectors.
They are more like that : http://cdn.stardot.com.au/media/ ... ATA-SATA%2045cm.jpg

tkaiser  
Edited by tkaiser at Tue May 5, 2015 02:09
chrisprols replied at Tue May 5, 2015 01:59
In case you are talking about that photo (actually the part on the top-right of the photo) :
http://cdn1.goughlui.com/wp-content/uploads/2013/10/IMG_5528.jpg


This is SATA power and SATA data combined. You just need to connect 5V/12V to SATA power (using an external PSU maybe the one from the enclosure you're trying to disassemble -- normally black is GND, red is 5V and yellow 12V) and use a normal SATA cable between BPi and the data connector on the disk.

hawhill  
Yes, the second photo, the upper right thing. It is simply SATA data connector (your "usual sata cable") with an adjacent SATA power connector (on a desktop PC, coming from the PSU). Their distance from each other (or lack thereof) is standardized, AFAIK.

tkaiser  
Edited by tkaiser at Tue May 5, 2015 03:00
hawhill replied at Tue May 5, 2015 02:25
Their distance from each other (or lack thereof) is standardized, AFAIK.


Correct and applies to both 2.5" and 3.5". The Lamobo R1 is also using this connector that's present in external enclosures:



In his case his enclosure comes with an external 12V supply and maybe he can get it to work using the step-down converter on the (lower side of the) PCB when contacts are large enough to solder a SATA power connector with 5/12V/GND/GND.

Seems so:

The pinout can be seen here (3.3V can be ignored): http://pinouts.ru/Power/sata-power_pinout.shtml

aaahhhh. ok. I get it now.

thanks a lot for those answers.

I'm looking at the combined connectors on amazon, just now.
I'l leave for later the question on how to connect the GND, +5V and +12V from what I'll salvage (wall PSU and connector board from the original package) to the standard combined connector.

@tkaiser, your setup is great ... but I won't have that modular PSU you got !

Quick question :
do I need to connect the grounds together ? (the ground of the HD power to the ground of the Banana)
Does the HD use GND, +5V and +12V ? or just GND and +5V ? or just GND and +12V ?

tkaiser  
Edited by tkaiser at Tue May 5, 2015 03:10
chrisprols replied at Tue May 5, 2015 02:58
do I need to connect the grounds together ? (the ground of the HD power to the ground of the Banana)
Does the HD use GND, +5V and +12V ? or just GND and +5V ? or just GND and +12V ?


You need 5V, 12V and two times GND. Pins 4 to 15 on the PCB in your enclosure. If you have soldering skills, just solder 3 Pins to one cable end (the very same thing happens in the SATA power connector on the other side where each cable will provide 3 pins each since they're too tiny for larger currents).

The PCB in the enclosure will be fed with 12V (and 3A I would assume) and provides 5V/12V to the drive. Don't even think about connecting GND between BPi and disk. In case your enclosure's PSU has enough power then it might also be able to power the BPi as well.

I made some tests in the past and even when overclocked I didn't manage to let the BPi consume more than 5V/0.6A under full load:



But I didn't had any peripherals connected to it. In case you connect bus-powered USB peripherals the current needed on the 5V rail might increase drastically.

BTW: You don't need such a combined SATA sata/power connector. You could also simply use a standard SATA data and a standard SATA power cable (the latter being fed by the enclosure's PSU when you're able to solder the stuff)

Edited by chrisprols at Tue May 5, 2015 03:34

Ok.
So I'll just use the PCB of the original enclosure to convert the 12V fed by the PSU to GND, +5V and +12V.
I'll solder 3 Pins (gnd, 5V and 12v) of the PCB to some wire and connect those wires to the connector going to the hard drive.
In parallel, I'll connect the data SATA cable on the hard drive (on one side) to the SATA connector of the banana (on the other side).

side note : I bought a combined sata cable (data + power) because I don't have much of those laying around. I might have a data sata cable. But for sure I have no power cable.

One thing I didn't get (=understand) from your post :
You need 5V, 12V and two times GND. Pins 4 to 15 on the PCB in your enclosure.

I'm guessing you're explaining which pins I need to solder on my PCB from the original enclosure ... so (me being dumb) ... which pins do I need to solder to get GND, +5V and +12V ?

On the second half of your post, I understand that if no hard drive is powered through the banana, the board shouldn't need any super-duper power supply. Some standard 5V-1A should do.
I understood correctly ?
Would a capacitor help smooth the input voltage of the board ? Would this be usefull ? What capacity ?

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