Mac Pro can't running two fire wire hard disks at the same time .

Mac Pro can’t running any two fire wire hard disks at the same time . which two hard disks have extra power from power socket . If i just insert one of them .No problem . If connect two Hds at the same time. Leopard cant find it and the Hds seem no problem. the machine must be restarted and then use one . No problem . I have formated the HD many times .even if which format is Fat 32 or Mac issue persists .Boot from installation CD used the disk utility . Issue stills . If i used one fire wire HD that get power from power socket and used one fire wire device . Leopard was no problem during this time . Whether is this design problem or my machine hardware problem?My Mac has been changed the logic board by Apple service . Do you have similar case in here????

I connect both hard disks that get power from power supply normally. Also have ever changed the format as GUID. Which always use the power cord . I felt confusion why the issue just happened connect both hard disks with extra power at the same time. If i used one hard disk connect to firewire port . Another firewire port connect other firewire device . No problem at all.

Similar Messages

  • IMac can't running any two fire wire hard disks at the same time . which

    iMac can’t running any two fire wire hard disks at the same time . which two hard disks have extra power from power socket . If i just insert one of them .No problem . If connect two Hds at the same time. Leopard cant find it and the Hds seem no problem. the machine must be restarted and then use one . No problem . I have formated the HD many times .even if which format is Fat 32 or Mac issue persists .Boot from installation CD used the disk utility . Issue stills . If i used one fire wire HD that get power from power socket and used one fire wire device . Leopard was no problem during this time . Whether is this design problem or my machine hardware problem?My Mac has been changed the logic board by Apple service . Do you have similar case in here????
    Message was edited by: KennyG1983

    Hi KennyG1983-
    How are you connecting these drives?
    This may help: What to do if your computer won't recognize a FireWire or USB device
    Luck-
    -DaddyPaycheck

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