Leopard and kernal panic after starting up external hard drive

Hi,
After upgrading to Leopard, everytime I turn on my external hard drive after my Powerbook G4 starts up, I get a kernal panic and it says that I need to shutdown. So I do and when it restarts the disk is mounted fine with no problems. Why would it have a kernal panic? I don't need to access the external all the time so I don't need to have it on. What should I do?
Thanks,
Mary

Hi,
The drive is connected via firewire through the back of my Apple Cinema Display firewire hub. Out of curiosity, when I disconnect the drive from the ACD hub and connect it directly to my Powerbook Firewire connection, I found that I did not get a kernel panic when I turn on the drive. It mounts without a problem. It may be the ACD firewire connection.
This is the panic log that I get.
Wed Mar 12 16:20:32 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000000 PC=0x000000000073F278
Latest crash info for cpu 0:
Exception state (sv=0x3b37d500)
PC=0x0073F278; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x0073F1E8; R1=0x4E5FB630; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x0073F18C 0x00744264 0x00742D68 0x00770BE0 0x00759020 0x0077068C
0x00770480 0x003597CC 0x0003F93C 0x000B0454
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOFireWireFamily(3.4.0)@0x739000->0x793fff
Proceeding back via exception chain:
Exception state (sv=0x3b37d500)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x35736a00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9C31
Kernel version:
Darwin Kernel Version 9.2.0: Tue Feb 5 16:15:19 PST 2008; root:xnu-1228.3.13~1/RELEASE_PPC
System model name: PowerBook5,2
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x0009B2F8 0x0009BC9C 0x00029DC4 0x000AF090 0x000B28F8
Proceeding back via exception chain:
Exception state (sv=0x3b37d500)
PC=0x0073F278; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x0073F1E8; R1=0x4E5FB630; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x0073F18C 0x00744264 0x00742D68 0x00770BE0 0x00759020 0x0077068C
0x00770480 0x003597CC 0x0003F93C 0x000B0454
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOFireWireFamily(3.4.0)@0x739000->0x793fff
Exception state (sv=0x35736a00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task

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