External hard drive mounted as Zero KB available?

Hi, when I plug in my USB external hard drive Tiger will mount the disk as having zero kb available. Under the disk utility it shows the hard drive nave 20+ GB free space. the hard drive works well in other operating systems. I have a MAC BOOK. Any suggestion what might have caused this?

Hi, and a warm welcome to the Forums!
What size drive is it?
What format is it? DU, highlight it, then the Info button.

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