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USB 2.0

Posted: Sat Jul 18, 2015 5:18 pm
by Joe Joejoe
I am considering buying a raspi but I read on Wikipedia that Raspberry Pi 2, Model B, has USB 2.0 and not USB 3.0.

See if I were to purchase a raspi I would want to attach an external disc to it but USB 2.0 is just too slow. It would have to be USB 3.0. Cloud storage and NAS (network attached storage) are not options for me.

What other options are available? Has anybody developed a way to attach an external disc, perhaps using the GPIO pins, and get reasonable transfer rates? I am not looking to boot from an external disc, just have it attached and usable as additional storage. Yes, I know all about mounting discs under Linux but this post is NOT about mounting discs it's about the physical connection and decent (> USB 2.0) transfer rates.

Re: USB 2.0

Posted: Sat Jul 18, 2015 5:58 pm
by fruitoftheloom
Joe Joejoe wrote:I am considering buying a raspi but I read on Wikipedia that Raspberry Pi 2, Model B, has USB 2.0 and not USB 3.0.

See if I were to purchase a raspi I would want to attach an external disc to it but USB 2.0 is just too slow. It would have to be USB 3.0. Cloud storage and NAS (network attached storage) are not options for me.

What other options are available? Has anybody developed a way to attach an external disc, perhaps using the GPIO pins, and get reasonable transfer rates? I am not looking to boot from an external disc, just have it attached and usable as additional storage. Yes, I know all about mounting discs under Linux but this post is NOT about mounting discs it's about the physical connection and decent (> USB 2.0) transfer rates.
Yes USB 2.0 is the best you will get ;)

Re: USB 2.0

Posted: Sat Jul 18, 2015 6:14 pm
by Joe Schmoe
You might be interested in the "Lemon Pi" board (google it).

It claims some level of compatibility with the Rpi, and it has USB 3.

Re: USB 2.0

Posted: Sat Jul 18, 2015 6:26 pm
by JF002
If you really need all the bandwidth available on USB3.0, you'll need a higher-end (and higher priced) device. High-end NAS cost more money than a RaspberryPi, there has to be a reason for that...

Some device may be compatible with USB3.0, but may not provide the full speed of USB3.0.

That beeing said, the RaspberryPi supports up to USB2.0.
And I don't think you'll be able to drive any kind of hard drive faster by using GPIO...

Why NAS are not an option for you? What will be your use-case(s)? How will you transfer data to/from your external hard-drive?

Re: USB 2.0

Posted: Sun Jul 19, 2015 2:24 am
by mikronauts
The Pi is NOT meant to be a NAS.

You can use it as such, and I explained the USB & network bandwidth limitations at:

http://www.mikronauts.com/raspberry-pi/ ... ent-howto/

You may also find the following useful:

http://www.mikronauts.com/raspberry-pi/ ... ter-tests/

The Banana's are a better choice for a NAS due to having a SATA interface and a gigabit nic

http://www.mikronauts.com/banana-pi/ban ... ive-tests/

Use the right tool for the job...
Joe Joejoe wrote:I am considering buying a raspi but I read on Wikipedia that Raspberry Pi 2, Model B, has USB 2.0 and not USB 3.0.

See if I were to purchase a raspi I would want to attach an external disc to it but USB 2.0 is just too slow. It would have to be USB 3.0. Cloud storage and NAS (network attached storage) are not options for me.

What other options are available? Has anybody developed a way to attach an external disc, perhaps using the GPIO pins, and get reasonable transfer rates? I am not looking to boot from an external disc, just have it attached and usable as additional storage. Yes, I know all about mounting discs under Linux but this post is NOT about mounting discs it's about the physical connection and decent (> USB 2.0) transfer rates.

Re: USB 2.0

Posted: Sun Jul 19, 2015 7:13 pm
by InsideJob
Yeah, USB 3.0 or eSATA would have been the cat's meow, but the built-in card reader doesn't go through USB (like the built-in Ethernet does, d'oh.) Walmart has SanDisk "Extreme Plus" 32 gig UHS-3 cards for US$30. My Pi2 boots VERY fast! I've got over 20 gigs of MP3s on mine that I serve up via bluetooth.

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