External hard drive and upgrading to Tiger

Hi all, if this has been posted and answered before you can just refer me to the post, I did a search but couldn't find anything. I have an external HD (LaCie 500gb) attached to my iBook that has OS 10.3.9 (Panther). I want to upgrade my computer's OS to Tiger, but am wondering if I will run into problems with the hard drive not working or mounting, etc. Has this been an issue before? Does it matter? I don't want to lose my external HD, its got lots of pics and music on it, but I'm itching for the new iPhone which needs 10.4 so I want to upgrade. Ideas? Suggestions of things to do before upgrade, etc?
Thanks so much for your help!
K

Hi Karen,
To be safe it would be best to backup/clone to the external... is it Firewire?
Then unplug the external... it's rare, but for a few has caused problems.
And of course before you do anything to/with the Internal, it's great practice to do these...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot.

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I'm re-posting the answer to this problem so I can show it has been answered:
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Hi turingtest2,
Thank you for replying. I've been looking at your posts about setting up iTunes using an external drive. A bit of background info. My old computer broke down, so I got a new one from work. I've always kept my music files on my external drive (I have around 170GB of music). I didn't follow the suggestions in the "migrate iTunes library" post because my old computer died on me. However, I've looked at your posts about lay out of the iTunes folders. Before connecting to iTunes on the new computer, I had reorganized my iTunes folder on my E: external drive, and created an iTunes folder which contains an iTunes Media subfolder. The music files are in a Music folder, which is in the iTunes Media folder. I've also put the following files in my iTunes folder: iTunes Library.itl, iTunes Library Extras.itdb, iTunes Library Genius.itdb, iTunes Music Library.xml, as well as sentinel. I then followed the advice you gave bmw99 on 2 Nov 2013 at 9.58 (sorry, can't copy the exact answer).
Just to clarify: I'd like to keep all my music media on the E: external hard drive (the computer hard drive is too small), and I'm aware i might never have my playlists back, and that all the songs in my library might be ticked. However, I don't want my library to be duplicated.
I'm at work at the moment, but will be back home in about 10 hours, so I can be more specific about folders / files names.
I'm glad you picked up my message and greatly appreciate your help.
Patrice

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