Is there a difference between usb and usb 2.0?

[Joshua Pollak]

The issue is that if you install one USB 1.1 device on a USB 2.0 bus, the
entire bus is forced to slow down to 1.1 speeds. However, if you have a
slow speed USB 2.0 device out there, it will allow the rest of the bus to
operate at a high speed data rate, even though it has a lower data rate
itself.

Basically, slow speed USB 2.0 devices support USB 2.0 signaling, while USB
1.1 devices do not.

-Josh

> There was an article a bit back on /. about manufacturers labling things
> at USB 2.0 when it was really 1.1.  I think the key factor is 'fast usb'
> or whatever its called which is really 2.0.. Its all a big mess..
>
>
> -miah
>
> On Sun, Dec 21, 2003 at 01:50:54PM -0500, Scott Ehrlich wrote:
>> Sorry I missed the original post.
>>
>> >From my experience in computer support and BIOS upgrades, the USB port
>> is
>> capable of doing whatever BIOS tells it (I believe), just like with IDE
>> >
>> EIDE, and parallel ports going from unidirectional > bidirectional, etc.
>> The hardware is there.  It is just a matter of what the instructions in
>> firware dictate.
>>
>> If you can find a BIOS upgrade for your machine (check with the
>> manufacturer) which updates the USB code from 1.1 to 2.0 (i.e. faster
>> speed), then you, too, can benefit.
>>
>> Scott
>>
>> On Sun, 21 Dec 2003, Johannes B. Ullrich wrote:
>>
>> >
>> > From my (limited) experience, USB 2.0 drives will work with USB 1.1
>> > laptops. However, the speed will be very slow. USB 2.0 PCMCIA cards
>> > usually run $25-50.
>> >
>> > What kind of laptop is it? Does it have firewire? Maybe another option
>> > is to swap the CD drive in the laptop for a used CD-RW drive?
>> >
>> > Your laptop is most likely USB 1.1. Most laptops until very recently
>> > included 1.1 only.
>> >
>> >
>> > On Sun, 2003-12-21 at 13:09, Ken Gosier wrote:
>> > > There's a very cool-looking external cd-rw on sale over at
>> overstock.com:
>> > >
>> > > http://www.overstock.com/cgi-bin/d2.cgi?PAGE=PROFRAME&PROD_ID=570145
>> > >
>> > > The only problem is: It says USB 2.0. I have a relatively old laptop
>> > > (almost 3 years now.) So I'm worried that my usb ports aren't the
>> latest.
>> > >
>> > > I've read all over the laptop docs, and they just say "usb" w/o a
>> version
>> > > number. I also looked over the faq on usb.org, and it also doesn't
>> mention
>> > > anything about different versions.
>> > >
>> > > Are there differnent usb versions? Is this something to worry about?
>> Many
>> > > thanks for any help--
>> > --
>> > CTO SANS Internet Storm Center               http://isc.sans.org
>> > phone: (617) 786 1563
>> >   fax: (617) 786 1550                          jullrich at sans.org
>> >
>> >
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