Dual Drives on One Firewire Port?

Discussion in 'Macintosh Computers' started by Ozamandiz, Oct 4, 2005.

  1. macrumors newbie

    Oct 4, 2005
    I recently purchased a Firewire Bridge board (small circuit board) that can support two IDE drives, one master and one slave--very common. When I connect the two drive to my G5 (running Tiger 10.4), it only sees one drive--the master.

    If the master is removed, then the iMAC can see the slave drive. If the master is reconnected, then it can only see the master. When the board is connected to an IBM compatible PC, it can see both drives so the bridge board is working.

    Does anyone know if this "one drive limit" is part of the Firewire implementation on the iMAC, or it is a limitation of the operating system?

    Thanks for any information!
  2. macrumors 6502a


    Sep 23, 2003
    London, England
    is there a 'master/slave' jumper on the ide drives? one will have to be set to master the other to slave.
  3. macrumors 68020


    Feb 3, 2004
    Virginia Beach, VA
    I agree that jumper settings should be the first thing you explore. If the ones above suggested don't work, try other combinations. I bet one of them will work properly.
  4. macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    No, there is no such limit in Mac hardware or software. For example, the LaCie Big Disk Extremes are all 2-drive enclosures. WiebeTech and Granite also have dual and 4-drive FW enclosures. The problem is between your bridge board and your drives. Go back to the bridge board manual and start again. Does the Bridge board support Mac? What quality is it?
  5. macrumors 603


    Jun 25, 2002
    LaLaLand, CA
    If they're both set to cable select, change it to master and slave. If it's m and s, change to cs. I forget which is better on the Mac, but that's probably your problem. Any fw bridge should be compatible with Macs.
  6. macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Internally, the Mac uses Cable Select. The firewaire bridge would have its own requirements since it's talking to the drives.

    Some drives have different jumpers for "Master" and "Master with Slave", also if the drives are not the same model, try switching which one is set to be the master - not all drives are created equal.
  7. macrumors 6502

    Sep 18, 2005

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