Yes, I prefer to check the power supply first, if it is not the root problem, then go to check others. Have you tried plug into one _powered_ hub between the Host and the usb disk? It will help in my experience. BTW, what is you usb disk cable look like? Is that like [A] ______________[B] [A} ____/ If so, you can first add the two [A] connecter to the Host, and then plug the [B] connecter to your device. Thanks, Jung 2009/11/12 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > Please use Reply To All, so that your messages are sent to the mailing > list as well as to me. > > On Thu, 12 Nov 2009, Michel wrote: > >> Hi Alan, >> >> thanks you for your help! >> >> hum...excuse my english but i'm french, i didn't understand precisely >> the term "run off power". (insufficent energy i presume ?) > > I was asking if the disk drive gets all its power from the USB > connection. > >> The Hard Disk has two usb cables, one for power supply (optional), >> another for USB transmission. >> When i connect the two (connecting first the usb cable power supply, and >> after the usb data transmission cable.) >> The problem is not resolved. lsusb or /proc/bus/usb/devices don't show >> nothing more. >> i test all my usb ports, the device is not reactive. > > It sounds like the ports don't supply enough power for the drive to > run. Or else the drive is broken, but you said that it still works on > other computers. > >> Is it possible that there's a BIOS limitation of usb power supply (that >> can be changed?) > > No. > >> i'm going to verify if i find something on the subject. >> >> if you see another thing, i remains attentive, > > Have you tried using usbmon to trace what happens when you plug in the > drive? See Documentation/usb/usbmon.txt. > > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
