How much free space is necessary on the hard drive?

although the message 'Startup disk is almost full' is coming up, what is the amount of free space required to run 10.4 normally?

773/3219
Hi Brian,
This is not an exact, immutable value, but it is usually understood that Mac OS X needs about 10% to 15% free hard drive space.
Now you most probably can count a minimum of 5 GB, in order to run the (about) 4 GB system (Tiger), regardless of the total size of the HD.
Another useful info:
Depending on your habits and on what you do with your computer, look at the fluctuations of the VM size number in Activity Monitor. It shows quite accurately how much free space the OS needs to "breathe" well.
In a word: 10-15%.
Axl

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