> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Leslie Katz > Sent: 2006-Oct-26 03:51 > To: linux-usb-users@lists.sourceforge.net > Subject: [Linux-usb-users] Difference between internal and > external USBports? > > My computer (bought in early 2002) came with USB 1.1 ports only. > > I installed a PCI card that gave me two external USB 2.0 > ports and got along with that till recently. > > Then, wanting more USB 2.0 ports, I transferred the two-port > card to another computer and replaced it with what I thought > when I bought it was a four-port USB 2.0 card. However, when > I took the card out of its package, I saw that there was one > internal USB port, as well as the four external ones. > > I thought I'd take advantage of the internal port by > attaching one end of a USB cable to it, running the cable > through a hole in the back of the computer case and then > plugging a flash drive into the other end of the cable. > > I did that and also plugged a USB hard drive into one of the > external ports. When I booted up, there were icons on my > Desktop for both USB drives and each drive worked properly. > > However, when, while the computer was running, I plugged > another flash drive into one of the three vacant external > ports, the icon for the first flash drive disappeared and no > icon appeared for the second flash drive. > > I shut down, removed the second flash drive and rebooted. > Again, I had the two icons and each drive worked perfectly. > > I ran usbview and it told me that I had an EHCI Host > Controller with four ports, not the five I expected. It also > listed the two attached USB devices. > > The computer dual-boots with Windows XP. I booted into > Windows with the two USB devices attached. I looked at My > Computer and saw the two USB drives listed. They both worked > properly. I then plugged the second flash drive into one of > the USB 1.1 ports and was told that I had a VIA Enhanced Host > Controller with a "USB Root Hub (4 ports)", that two of those > ports were taken by the USB drives and that two were vacant > and that I should use one of them. Again, I was being told I > had four ports, not the five I expected. > > I unplugged the second flash drive from the USB 1.1 port and > plugged it into a vacant external USB 2.0 port. I had My > Computer open as I did it. Just as in Linux, the "Removable > Disk" entry disappeared and no other one replaced it. > > If anyone can tell me what's going on, I'd be very grateful. > Is there something different about the internal USB port > which is causing the above to happen? Should I not be trying > to use it?
You might well find that the internal connector is simply wired in parallel with one of the external connectors. This gives you the choice of using an internal USB device or an external one. What you /can't/ do is to connect both at the same time. It's either or. Dave ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
