Firewire Devices Drop Off

I have several LaCie Firewire drives that I use for backup. They were working fine and were connected always to my machine as was my iSight. About a 2 weeks ago this all changed. The harddrives would suddenly drop off the desktop and I would get a message that I disconnect the drives improperly. If I disconnected the drives and reconnected them most of the time they would come back up, but sometimes I would have to use Disk Warrior to rebuild before they would show up. I also noticed at about the same time that sometimes when I started a video conference only the audio was available. If I unplug and replug the firewire connection to the iSight it would start up. As a final test, I took the LaCie Drives to work and connected them to my G5 Tower and left it on all day with no problem. Does this sound like a hardware problem with my iMac or does someone have some advice about what else could be the problem?
iMac G5 Mac OS X (10.4.5)
iMac G5 Mac OS X (10.4.5)

Mac 1 Ghz G4 1 gig Ram Os 10.4.5
My Firewire connected LaCie Bigdrive started disconnecting spontaneously with a complaint from the iMac that it was disconnected improperly.
Finally it did so once more and has not mounted via FW since. However, USB does mount it but big files take all day to transfer.
I took out the Maxator from the LaCie drive and put it in a FW/USB caddy, ok for a while then the same story. USB only mounting.
Informed with some confidence by a poster on Bombich's website
( http://forums.bombich.com/viewtopic.php?p=25658#25658 ) that it was the boot drive OS
Tried new cable. repaired boot drive disc, repaired permissions, ran DiscWarrior over it, repaired permisssions, ran downloaded 10.4.5 combo, ran DiscWarrior over it and finally repaired permissions again.
No Joy.
i would most appreciate useful suggestions.
Regards and thanks in advance
Anoop in the UK
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Hihi,
Long time lurker, first time post:-)
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panic.log:
Description: Panic (system crashes) log
Size: 7.61 KB
Last Modified: 19/12/2008 16:27
Location: /Library/Logs/panic.log
Recent Contents: ...
Backtrace:
0x002B98A0 0x002FEA4C 0x002FE8C0 0x002B7A98 0x002B7AEC 0x0008A6C0
0x0008A730 0x000291D0 0x0001AB84 0x00029574 0x00048DFC 0x0001D9CC 0x0001FD7C 0x000215CC
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com.apple.iokit.IOFireWireAVC(1.8.1)@0x590000
dependency: com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
Proceeding back via exception chain:
Exception state (sv=0x319F4780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x3175BA00)
PC=0x90031C64; MSR=0x0000D030; DAR=0xA000C9F8; DSISR=0x0A000000; LR=0x90052328; R1=0xBFFFA420; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.2.2: Mon Aug 22 18:43:11 PDT 2005; root:xnu-792.5.11.obj~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095698 0x00095BB0 0x0002683C 0x000A8304 0x000ABC80
Proceeding back via exception chain:
Exception state (sv=0x319F4780)
PC=0x005651CC; MSR=0x00009030; DAR=0x11EB9000; DSISR=0x40000000; LR=0x0059FC2C; R1=0x177F3840; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002B98A0 0x002FEA4C 0x002FE8C0 0x002B7A98 0x002B7AEC 0x0008A6C0
0x0008A730 0x000291D0 0x0001AB84 0x00029574 0x00048DFC 0x0001D9CC 0x0001FD7C 0x000215CC
0x00038040 0x00263A78 0x00270200 0x00025250 0x000AC0B8
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOFireWireAVC(1.8.1)@0x590000
dependency: com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
com.apple.iokit.IOFireWireFamily(2.0.8)@0x54d000
Exception state (sv=0x3175BA00)
PC=0x90031C64; MSR=0x0000D030; DAR=0xA000C9F8; DSISR=0x0A000000; LR=0x90052328; R1=0xBFFFA420; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.2.2: Mon Aug 22 18:43:11 PDT 20050
Thu Aug 14 14:56:19 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000000 PC=0x00000000002FA4D8
Latest crash info for cpu 0:
Exception state (sv=0x61A82C80)
PC=0x002FA4D8; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002FA4D4; R1=0x46803C30; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002FA4D4 0x62A9E554 0x62A9E66C 0x00302900 0x00302984 0x002FB00C
0x0003CA1C 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.StorageLynx(1.5.1)@0x62a9d000
dependency: com.apple.iokit.IOFireWireSBP2(1.7.5)@0x61575000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.4.9)@0x557000
dependency: com.apple.iokit.IOFireWireSerialBusProtocolTransport(1.4.4)@0x61593000
dependency: com.apple.iokit.IOFireWireFamily(2.2.5)@0xa37000
Proceeding back via exception chain:
Exception state (sv=0x61A82C80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x78946000)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x61A82C80)
PC=0x002FA4D8; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002FA4D4; R1=0x46803C30; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002FA4D4 0x62A9E554 0x62A9E66C 0x00302900 0x00302984 0x002FB00C
0x0003CA1C 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.StorageLynx(1.5.1)@0x62a9d000
dependency: com.apple.iokit.IOFireWireSBP2(1.7.5)@0x61575000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.4.9)@0x557000
dependency: com.apple.iokit.IOFireWireSerialBusProtocolTransport(1.4.4)@0x61593000
dependency: com.apple.iokit.IOFireWireFamily(2.2.5)@0xa37000
Exception state (sv=0x78946000)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x0000
Fri Dec 19 16:27:19 2008
panic(cpu 1 caller 0x000E83E4): vnode_put(7f5a210): iocount < 1
Latest stack backtrace for cpu 1:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000E83E4 0x000E8390 0x0010DECC 0x0010E144 0x0010E368
0x000FBA54 0x000E249C 0x000E2030 0x000F51A0 0x000ED4E0 0x000ED898 0x002ABDB8 0x000ABD30
0x6963743E
Proceeding back via exception chain:
Exception state (sv=0x6192B780)
PC=0x90001B2C; MSR=0x0200F030; DAR=0x003E6004; DSISR=0x40000000; LR=0x00005488; R1=0xF0303D50; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC

The KP does look Firewire connected; so unplug it.
Understanding crash logs isn’t easy and it’s hard (sometimes impossible) to decipher the cause of the problem. Take a look at Apple’s Crash Reporter document at http://developer.apple.com/technotes/tn2004/tn2123.html
Also look at Tutorial: An introduction to reading Mac OS X crash reports
http://www.macfixit.com/article.php?story=20060309075929717
Kernel panics are usually caused by a hardware problem – frequently RAM, a USB device or a Firewire device. When trying to troubleshoot problems, disconnect all external devices except your monitor, kbd & mouse. Do you experience the same problems?
If you suspect RAM,look at this link: *Testing RAM* @ http://guides.macrumors.com/Testing_RAM Then download & use Memtest & Ramber.
May be a solution on one of these links.
Resolving Kernel Panics
Avoiding and eliminating Kernel panics
12-Step Program to Isolate Freezes and/or Kernel Panics
 Cheers, Tom

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