How can I make my external hard drive writable?

I have a 60GB external hard drive (half used, so got about 20 free GBs on it)
It is writable by Windows and Linux, but is "read only" on Mac.
Is there a way I can partition part of it to be writable with Mac?

So FAT32 then?
Ok, so in the future if I ever buy a new external hard drive, I should format it right away to FAT32... that's good to know
I was thinking of buying a 500GB drive, so maybe I'll wait (rather than partition the 60GB one) and format it to FAT32.
When I got the 60GB, it came already formatted as NTFS.

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