External FW Enclosure Woes

Hi all,
haven't posted here for a long while, i suppose that's a good thing :P
anyway i'm having trouble with FW, an enclosure, and a HD with two partitions that i want.
The original FW enclosure i had did something strange - when on it caused some manner of interference with my speaker system! Out of the blue one day after several years of reliable use. I figured something serious was wrong (shielding blown or something) and switched over to an older FW enclosure that had a few more features but was problamatic earlier. it still is.
The problem is that after waking up the computer (running 10.4.8) the partitions/volumes don't mount, or are problamatic. Sometimes they seem to work but it's hard to put a thumb on how often the problem occurs - i'd say about 98% of the time anyway. The icons appear on the desktop as normal and no warnings about device removal appear. Trying to open the volumes results in a finder hangup and general system hangup (spinning beach ball). Turning off power to the device, brings back system response (all activity attempted proceeds in a flood of activity) and turning the FW enclosure back on results in the volumes mounting and working.
I've tried resintalling the Tiger Combo update, permission checks and several other problems. I recall doing a fairly extensive troubleshooting round the last time i tried to tackle this problem. This time i've poured through my system log and these are the relevant snipets that seem to hint something's amiss.
Nov 27 00:07:38 ######## kernel[0]: USB caused wake event (OHCI) - mouse click to wake up system
Nov 27 00:07:38 ######## kernel[0]: FireWire (OHCI) Apple ID 52 built-in: handleSelfIDInt - received quads == 0. issuing bus reset - !!!
Nov 27 00:16:39 ######## kernel[0]: disk1s12: I/O error. - one for each volume ?
Nov 27 00:16:39 ######## kernel[0]: disk1s12: I/O error.
Nov 27 00:16:39 ######## kernel[0]: disk1s12: media is not present.
Nov 27 00:16:39 ######## kernel[0]: disk1s12: media is not present. - this last message ad nauseum
does anyone know what's going on? what those log messages mean? does anyone know how to make sure that those volumes are mounted? I'm not sure how to do it but i assume worse come worse it would be possible to write an apple or shell script that could check that those volumes are mounted once a wake event is called and if they aren't remove any hollow references and remount them?
Help and ideas appreciated (so long as they aren't get a new FW drive)
Thanks
DKR

Hi, DKR.
The handleSelfIDInt messages can sometimes indicate issues with either the FireWire bus on the Mac in question or the FireWire device itself. However, the FireWIre bus is reset whenever a FireWire device is connected or disconnected: that specific handleSelfIDInt message may be nothing more than informational.
Unfortunately, I've been unable to find any specific documentation about handleSelfIDInt on either the Apple Developer Connection or the Developer mailing lists related to either FireWire or the Open Host Controller Interface (OHCI).
In addition to a. brody's advice, I suggest you consult my "General FireWire troubleshooting" FAQ.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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