Q: How do I remove OS 9 and make disk available to OSX 10.4.11?

You imac will be more valuable with os 9 on the hd.  OS 9 isn't so big anyway.

You could:

http://www.macupdate.com/app/mac/7402/omnidisksweeper

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.

(0)

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.

(1)

Empty the trash.  Space isn't reclaimed until you empty the trash in three places!

The trash can...

--  in the dock

-- for iPhoto

-- with Mail

(2)

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.

(3)

These pages have some hints on freeing up space:

http://thexlab.com/faqs/freeingspace.html

http://www.macmaps.com/diskfull.html

(4)

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

(5)

Buy a flash card.

(6)

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

Verify that the "/System Folder" is the mac os 9 system folder.

Small enough not to worry about.

Looks like it to me.