USB1 USB2 COMPATIBILITY

  the-george 20:19 20 Aug 2006
Locked

I am looking to buy a 3.5" external caddy to house a spare IDE hard drive. I am assuming that if an advert specifies it is USB 2 then it will still be compatible with the USB 1 ports on my PC.
I understand the speed will not be up to USB 2.

Am I correct in my assumption as I dont want to buy a turkey.

  Totally-braindead 20:23 20 Aug 2006

It "should" run as they are backwards compatible BUT USB 1.1 speeds are much lower than USB 2.0 speeds and consequently it will be very slow.

I'm sure someone will correct me on this if I'm wrong but I think USB 2.0 is about 10 times faster than USB 1.1.

  mgmcc 20:23 20 Aug 2006

Yes, the USB 2.0 caddy should work with a USB 1.1 port albeit at a slower speed. It is unlikely that the drive would actually run at the full speed of 480Mbps supported by the USB 2.0 standard.

  mgmcc 20:25 20 Aug 2006

<<< I'm sure someone will correct me on this if I'm wrong but I think USB 2.0 is about 10 times faster than USB 1.1. >>>

40 times faster :-)

USB 1.0 supports 1.5Mbps

USB 1.1 supports 1.5Mbps and 12Mbps

USB 2.0 supports 1.5Mbps, 12Mbps and 480Mbps

  woodchip 20:25 20 Aug 2006

Yes, but if you are running 98se or ME you can get a PCI USB2 card that will run at USB2 if you get one with a Via chipset on the card and you get drivers with it. AS I have just done that with my 98se comp. though I had to download drivers from the net before it would work as Enhanced USB2

  the-george 20:26 20 Aug 2006

Could I add a USB2 PCI card and run the USB1 ports at the same time?

  ade.h 20:27 20 Aug 2006

With a few exceptions, most devices will not prevent you from using them with a 1.1 interface, though you will get patronised by an XP pop-up every time you plug it in.

  ade.h 20:27 20 Aug 2006

Yes, to your second question.

  Totally-braindead 20:28 20 Aug 2006

If it doesn't work and you have a PCI slot free, thats the white ones, just buy a USB 2.0 card like this click here or this click here or one of these USB cards click here

  the-george 20:32 20 Aug 2006

One final question. How can I find out the version of USB currently on my PC i.e. USB1 or 1.1.
Looked in device manager but cannot tell from there
Running ME.

  Totally-braindead 20:55 20 Aug 2006

Look under device manager again and find the USB, double click on it and look at what it says when it expands. If it uses the word enhanced then you have USB 2.0 if not you have USB 1.1.

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