You need to delete some files ASAP. Best to have greater than 2gig of free space. Many posters to these forums state that you need much more free space: 5 gig to 10 gig or 10 percent of you hd size.
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Be careful when deleting files. A lot of people have trashed their system when deleting things. Place things in trash. Reboot & run your applications. Empty trash.
Go after large files that you have created & know what they are. Do not delete small files that are in a folder you do not know what the folder is for. Anything that is less than a megabyte is a small file these days.
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Run
OmniDiskSweeper
"The simple, fast way to save disk space"
OmniDiskSweeper is now free!
http://www.omnigroup.com/applications/omnidisksweeper/download/
This will give you a list of files and folders sorted by size. Go after things you know that are big.
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These pages have some hints on freeing up space:
http://thexlab.com/faqs/freeingspace.html
http://www.macmaps.com/diskfull.html
(3)
Buy an external firewire harddrive.
For a PPC computer, I recommend a firewire drive.
Has everything interface:
FireWire 800/400 + USB2, + eSATA 'Quad Interface'
&
save a little money interface:
FireWire 400 + USB 2.0
This web page lists both external harddrive types. You may need to scroll to the right to see both.
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
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Buy a flash card.
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This will save you a gig of space.
Monolingual is a program for removing unnecessary language resources from Mac OS X,in order to reclaim several hundred megabytes of disk space. It requires at least Mac OS X 10.3.9 (Panther) and also works on Mac OS X 10.4 (Tiger). It worked for me on 10.4
http://monolingual.sourceforge.net/
A detailed write-up on how to use Monolingual:
http://www.jklstudios.com/misc/monolingual.html