External LaCie HD not being recognized after 10.5.6 upgrade?

My LaCie HD used for Super Duper backup is not being recognized by OSX. I also use a WD HD for Time Machine backup.
Before I upgraded to 10.5.6 i repaired permissions and backedup to the LaCie. Now when I turn on the drive, OSX does not see the drive.
I now see an icon in Super Duper in both the Source and Target areas called disk image. I have never seen this before. I do not see anything on my imac HD called disk image.
Any ideas?

Just to let everybody know that P-RAM reset resolved this problem.

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I had the same issue - the Seagate drive is in a format that will recognize both Windows and Mac formats and there seems to be a flaw with Seagate. After working on this for five hours and finally calling Apple, I found out why. If you reformat to Mac OS extended journaled then they usually start working properly.
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Did you recently update to 10.4.10? Is there another computer that you can plug the external into to see if it's recognized? Have you tried plugging another FW peripheral into your main computer to see if it recognizes it?
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1. Downloading and installing the combo updater of the system software update they've just applied via "Software Update...". In your case the update you need is at:
10.4.10 combo updater
2. Another trick is to restart each by zapping the parameter RAM:
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After the startup tone, hold down <commandd><option><r> until 3 additional startup tones are heard, then release the 4 keys.
3. A 3rd tip would be to do Open Firmware resets on each:
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set-defaults
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Also, see if anything in this Apple KB article helps:
http://docs.info.apple.com/article.html?artnum=88338
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Hi
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'sleep mode' ?
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Message was edited by: WRDinc

I had the same problem. See below for the answer from WD (...sigh...):
Cause:
Many 15" and 17" Macintosh PowerBook and Mac Book Pro Laptops do not provide enough power through a single USB port for the WD Passport™ external USB hard drive to work correctly. The WD Passport™ external USB hard drive requires a minimum of 1000Ma (Milliamps) of power for proper usage.
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http://discussions.apple.com/thread.jspa?threadID=1906969&tstart=0&messageID=906 6822#9066822
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eddiefb3 wrote:
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External LaCie HD not being recognized after 10.5.6 upgrade?

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