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View Full Version : How to make sure external hard drive is USB 2.0



yinglcs
8th February 2007, 05:25 PM
Hi,

I have an external hard drive.
Can you please tell me how linux use USB 2.0 to talk to that hard drive?

Thank you.

Seve
8th February 2007, 05:33 PM
Hello:
With the USB device plugged in type
cat /proc/bus/usb/devices
and you should see Spd=480 if it is connected as USB 2.0

Seve

yinglcs
10th February 2007, 07:20 PM
I see this, but which one am I using?

cat /proc/bus/usb/devices | grep Spd
T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 6
T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=480 MxCh= 0

Seve
10th February 2007, 07:35 PM
Hello:
Off-hand I have no idea ?
If you run
cat /proc/bus/usb/devices
it should provide you with some relevant information regarding Vendor etc. ?

Seve

u-noneinc-s
10th February 2007, 07:58 PM
Could it have anything to do with the order they are listed in?
I too show different readings (12's and 480's) but which is the connected USB. I only have one connected (unless you count the 6in1 I have never used).

u-noneinc-s
10th February 2007, 08:10 PM
Ah, I see. A couple of lines below "Vendor" it says Seagate External and it's connected to the 480 :D