Joe Joejoe
Posts: 1
Joined: Sat Jul 18, 2015 4:29 pm

USB 2.0

Sat Jul 18, 2015 5:18 pm

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.

fruitoftheloom
Posts: 20769
Joined: Tue Mar 25, 2014 12:40 pm
Location: Delightful Dorset

Re: USB 2.0

Sat Jul 18, 2015 5:58 pm

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 ;)
Retired disgracefully.....

Joe Schmoe
Posts: 4277
Joined: Sun Jan 15, 2012 1:11 pm

Re: USB 2.0

Sat Jul 18, 2015 6:14 pm

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.
And some folks need to stop being fanboys and see the forest behind the trees.

(One of the best lines I've seen on this board lately)

JF002
Posts: 94
Joined: Sat Feb 04, 2012 8:49 am
Contact: Website

Re: USB 2.0

Sat Jul 18, 2015 6:26 pm

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?
My web site : https://codingfield.com

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mikronauts
Posts: 2723
Joined: Sat Jan 05, 2013 7:28 pm
Contact: Website

Re: USB 2.0

Sun Jul 19, 2015 2:24 am

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.
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

InsideJob
Posts: 58
Joined: Sat Jul 04, 2015 3:00 pm

Re: USB 2.0

Sun Jul 19, 2015 7:13 pm

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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