What is the difference between USB 2.0 and USB 3.0

There is a new standard in the USB world called USB 3.0, in this article we will discuss the difference between USB 2,0 and USB 3.0. Universal Serial Bus or USB, as you all know is the most popular connection standard between devices and a host controller (usually located on a computer). USB has undergone many revisions and the latest USB hardware spec to come out is version 3.0, after version 1 and 2. Everything from your flash drives, mice, keyboard, PDAs, Game Consoles, GPS chargers, cell phone connectors and chargers,  GPS devices and bluetooth head sets all use USB in one form or the other. So lets see whats the differences between the most popular USB 2 and just out USB 3 standard are

Let me begin by saying that USB 3.0 is a major advancement over USB 2.0, far greater in impact than what USB 2 was over USB 1.0 . The biggest difference is the speed at which it can communicate with the computer's host controller and the biggest advantage is that it can maintain a backwards compatibility with USB 1 and 2.0. USB 2 had a maximum speed of 480 Mbps, which was great at that time but now it might not be enough because we now have USB thumb drives that are 64 GB in size, cell phone and PDAs that have a lot of internal storage built in, and even at 480 Mbps a full transfer of data in between devices can take a long time. In comparison to this, USB 3.0 boasts a maximum transfer speed of 4.8 Gbps yes, 4.8 Giga bits per second, almost 10 times faster than USB 2.0. Even with realistic numbers you can transfer data between your computer to a 64 Gigabyte thumb drive to full capacity in under 20 minutes!

Faster speed is not the only difference, power usage and requirements for USB 3 devices are much "greener". The USB 3 devices will provide more power when needed to the device to achieve a maximum throughput and conserve power when the device is connected but is idling. Modern operating systems such as Windows 7 already has support built in for USB 3.0 and Mother Board manufacturers already have the USB 3 port built in on the upcoming motherboards. The USB 3 port on a motherboard is characterised by a blue color (see the two images below showing USB 2 and USB 3 ports).

USB 3 in comparison to USB 2 can communicate its latency potential to the host which results in a better transfer performance, better asynchronous transfers are also going to improve communication between devices. The better transfer rates allow high bandwidth intensive devices and applications such as Hi Def Video streaming, Digital Video recorders etc a perfect candidate for USB 3.0. In comparison to other technologies, USB 3 leaves eSATA as well as Bluetooth protocols far behind in terms of speed and performance. Although there are not many USB 3 devices out there yet, but it will clearly become the standard in this new year 2010. Major operating systems vendors have already incorporated and embraced the standard, the good thing is the backward compatibility will not let your existing USB 2 devices go obsolete for another few years

USB2/3

Is this a new kind of butt-plug? I find it uncomfortable to use. I certainly was able to put lots of new shit on my computer. Ta for the advice.

Its not butt plug that why

Its not butt plug that why you are having problems. Put it at righ place and you would know how it works.

Power

What is the difference between USB 2.0 and 3.0 in the case of power ?

USB 2.0 normally can handle

USB 2.0 normally can handle 500 mA of power. USB 3.0 can handle 2.7A of power. Some Gigabyte motherboards have a USB 2.0 3x port which handles three times the normal power of a USB 2.0 port.

Computer

If I had a computer with USB 5.0 and I through it in a lake and a fish swallowed it would that make the fish the motherboard?

Of Course, Ahaab!

Of Course, Ahaab!

kaminey ko throw ka bhi

kaminey ko throw ka bhi spelling nahi aata through likh diya.... aur badi badi baatein kar raha hai

Haha...illiterate people

Haha...illiterate people teaching others... good one bro.

YES, that'll make you

YES, that'll make you 'Foolishly Fishy'...

I would suggest that you take

I would suggest that you take spelling lessons before owning a computer, thick skull.

uhoh,, We Have a Smart one here. Snap to

maybe they didn't care. Why do you? Get a life, this is about computers professor. Do you think you're the only one with a spell checker Genius? lmmfao

lol muppets!

lol muppets!

USB 3.0

Hi, I would like to know if it is possible to add a USB 3.0 port to my HP Laptop with Vista, and to my desktop with XP Professional. Is there a card I can plug in or install? I can work on the desktop but have never opened a laptop.

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The pro perk would help you when you need to get a stun around a corner very fast. I got numerous Information Technology Certification. Although it's pricey, is usually complicated and extremely technical, the outcome is usually a lot of entertaining

just a bit more technical

Every thing I read about the difference between usb 2.0 and 3.0 reads like an advertisement, with the most technical aspect being the results of benchmark tests or the mention of a somehow different controller. What are the mechanical differences between USB 2.0 and 3.0? Are there more contacts in the ports? Is the controller basically the only difference on the usb 3.0 port? Thanks, and yes I get that the transfer rates are faster.

i agree

i really agree its like they are selling it

I have a thought of buying a

I have a thought of buying a new hard disk.......its connectivity type is USB 3.0.......but i dunno whether it would connect properly with my pc, which has white ports.......HELP ME......

USB reply

Yes, it will work, itz called backward 2.0 support.

I have a thought of buying a

I have a thought of buying a new hard disk.......its connectivity type is USB 3.0.......but i dunno whether it would connect properly with my pc, which has white ports.......HELP ME......

I have a thought of buying a

I have a thought of buying a new hard disk.......its connectivity type is USB 3.0.......but i dunno whether it would connect properly with my pc, which has white ports.......HELP ME......

As it mentions in the

As it mentions in the article, USB 3.0 is backwards compatible, meaning yes it will support all of your USB ports.

Toshiba Canvio 3.0 Portable Hard Drive

I have a Toshiba Satellite laptop for college and I need to save my work at college and them open the folders at home on my laptop. My college uses Mac Machines. Will this portable hard drive work with Mac computers out of the box?

I read on another message

I read on another message board while researching the toshiba portable hard drive, is that it will work on a mac. But the person said that you would have to use two usb ports to power it. I guess you can buy a cable like a splitter to use.

If its a USB 3 drive then it

If its a USB 3 drive then it should be backwards compatible with USB 2. In other words, yes it would be compatible with your MAC computers out of the box.

Im sorry I'm confused if I

Im sorry I'm confused if I buy an external disk 3.0. will I be able to use it in a pc with windows 7 and without that blue stuff?

I'm sorry I'm confused if I

I'm sorry I'm confused if I buy an external hard drive disk 3.0 will I be able to use it in my computer hp with windows 7, that doesn't have the blue thing?

You will be able to use it,

You will be able to use it, but if your computer does not have that blue looking port then you won't be able to use the benefits of USB 3 technology, you will be using USB 2 speeds and technology

doubts about usb 3.0

i have an assembled pc. now i would like to buy an external HDD of "Toshiba Canvio usb3.0". will it work on my pc with usb 2.0? iam in a confusion now. anybody please help me..............plz...........

NO!!!! USB 3.0 DEVICES WONT

NO!!!! USB 3.0 DEVICES WONT WORK ON USB 2.0. USB 2.0 DEVICES WILL WORK ON USB 3.0.

Wrong!

Wrong!

Wrong!

Wrong!

Um..........very wrong sir. A

Um..........very wrong sir. A USB 3.0 device DO work on USB 2.0 ports. I have a portable hard drive, which uses USB 3.0 connectivity, that I use with my HP laptop, which uses USB 2.0 connectivity, and everything works flawlessly. No, I do not get USB 3.0 throughput rates between the two, but I do get connectivity between the two.

finally found out what i

finally found out what i actually needed to know. thanks

woah, relax guy

woah, relax guy

USB 3.0 Expansion Card

If you are not ready yet to switch out your motherboard, Transcend's USB 3.0 Expansion Card will allow you an opportunity to reap the benefits of USB 3.0 transfer speeds. This easy-to-install card enables you to add revolutionary new USB 3.0 ports to any desktop computer with a PCI Express slot, delivering data transfer rates up to 10 times faster than Hi-Speed USB (USB 2.0) with optimized power efficiency. The Expansion Card's PCI Express 2.0 x1 connection interface is compatible with virtually all current motherboards, and guarantees unrestricted two-way communication between your PC and any USB devices you plug into the card. With two SuperSpeed USB 3.0 ports, which have bandwidth up to 5Gb/s, Transcend's USB 3.0 Expansion Card is ideal for use with new USB 3.0 high-capacity external storage devices, such as external hard drives and USB flash drives. Go to http://in.transcend-info.com/products/usb3/index.asp?flag=3 for more info.

How do I know if I have a 3.0 port

I have a HP laptop with XP How can I find out if it will support a 3.0 1tb protable hard drive? Thanks

The port will be blue if it

The port will be blue if it is 3.0 (as shown in the article) and usb 2.0 IS compatible with usb 3.0

sorry i meant that it isnt

sorry i meant that it isnt compatible

What does it really mean to say USB 3 is backwards compatible

Hi John,

Did your HP laptop come with XP installed ? If it did come pre installed with XP, it sounds like its fairly a few years old and because USB 3 is a fairly new standard, chances are your laptop's mother board does not have USB 3 capabilty. Hence if you bought a USB 3.0 external external hard drive, it will not work with a USB 2 port. However, you will need to consult hardware specifications of your laptop's mother board. If you do not have access to the manual, I can try finding it out if you gave me your exact model of laptop, it should be available from HP's website.

People get slightly confused when we say "USB 3 is backwards compatible with USB 2 and 1.1"

What that really means is if your device has a USB 3 Port on it, it will be able to accomodate older USB 2 and USB 1.1 devices. However, if your laptop or computer does not even have a USB 3 port, then a USB 3 device will not work with it.

Hope that helps

Just want to say that my USB

Just want to say that my USB 3.0 flash drive works just fine in a USB 2.0 port on my machine. I suspect it would act the same if the roles were reversed. All it means is that my 3.0 flash drive will be working at 2.0 speeds when not connected to a 3.0 port. Thought I'd clarify the issue.

Umm

Some external hard-drives ARE both 2.0 & .0

You haven't mentioned

You haven't mentioned anything about USB 3.0 devices having a different connector to USB 2.0? Gaz

Yes, USB 3 has a blue

Yes, USB 3 has a blue connector.

The author stated that 3.0 is

The author stated that 3.0 is backwards compatible. So yes, the same.

The transfer rates were

The transfer rates were different but the the connector sizes were the same I thought, that's why they can be backwards compatible with USB 2

Data Transfer time

Your data transfer time for USB 3.0 is out by a factor of 10 times slower than actual. See: http://www.calctool.org/CALC/prof/computing/transfer_time Thanks for ecxzellent article oterwise.

The data conversion rate factor is correct

Thanks for your comment. The data conversion rate factor between USB 2 and 3 does differ by a factor of 10 as originally stated in this article. Rather than getting into actual math, I would explain in simple steps:

1. Go to google and type convert 4.8 Gbps to Mbps (Google does conversions for you, no need to go to online calculatores, Google is handy right in your toolbar :) )

2. From above calculation you can see 4.8 Gbps = 4,915.2 Mbps.

3. Now open the calculator on your computer, and do 4195.2 / 480 and you will get 10.23 which means 4915.2 is 10 times 480, hence whats stated in the article above is correct

Sorry Guys

Hey sorry if this has been described already, but will usb 3.0 be able to be used in usb 2.0 apple computer ports?

Yes, USB 3 is backwards

Yes, USB 3 is backwards compatible with USB 2, considering Apple follows standards, if an Apple machine has USB 3 ports, you should be able to plug in any USB 2 device on those ports and make it work. Does that answer your question ?

Re: Sorry Guys

I have a 2TB Seagate Hard Drive w/ a USB 3.0 plug, I run windows 7 but i know that on the hard drive it has the install software for both windows and Apple, so i'm sure it works just the same.