Dual interface at the same time

By giyad
May 26, 2009
  1. I haven't tried this and don't plan on it, but I was wondering... I have an external hard drive that interfaces USB 2, Firewiree 800/400, and eSATA. Now I know this doesn't make sense, but I just was wondering if someone could explain to me: Why can't I plug in the drive through multiple interfaces at the same time? Why can't the data be sent simultaneously through all interfaces?

    Can the controller only establish one connection at a time? What is limiting the device?
  2. gguerra

    gguerra TS Maniac Posts: 317

    To do this you need a device called Network Attached Storage (NAS for short). It has a network (ethernet) connection that will allow it to be shared my multiple users on a network. Your external hard drive has multiple connections for different types of users/machines but only one will work at a time.
  3. giyad

    giyad TS Enthusiast Topic Starter Posts: 59

    yes... but why does only one work at a time?
  4. gguerra

    gguerra TS Maniac Posts: 317

    It is that way by design
  5. jobeard

    jobeard TS Ambassador Posts: 9,160   +599

    actually, it is due to the routing tables.

    every time there's a connection made, an entry is made in the routing table
    C:\WINDOWS\system32>netstat -r
    Route Table
    Interface List
    0x1 ........................... MS TCP Loopback interface
    0x2 ...xx yy xx zz aa bb ...... Realtek RTL8139 Family PCI Fast Ethernet NIC - Packet Scheduler Miniport
    Active Routes:
    Network Destination        Netmask          Gateway       Interface  Metric
          [COLOR="Blue"] [/COLOR]       20
       20       20
         20       1
    [B]Default Gateway:[/B]
    Persistent Routes:
    Notice the default gateway!
    All new outbound connections will route thru to the connection on the other side (the ISP) and there can only be ONE default.

    All local LAN traffic flows via to my system NIC at to the router at

    adding another NIC to the system will create another row just like but with the IP address assigned by the DHCP on the other end (or static ip)
  6. gguerra

    gguerra TS Maniac Posts: 317

    jobeard, I think you misunderstood the original question. giyad was asking why he could not plug multiple PC's to his external hard drive, one using USB, one using firewire and one using esata and have all access the hard drive at the same time. Your post has to do with networking which I dont think he was asking about (correct me if I'm wrong)
  7. giyad

    giyad TS Enthusiast Topic Starter Posts: 59

    you are correct gguerra... wasn't asking about networking
  8. jobeard

    jobeard TS Ambassador Posts: 9,160   +599

    :eek: grrrr :eek::wave:
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