Can I use one HD for 2 computer for time machine?

I have an imac and macbook. I bought a new 500G external harddisk for time machine.. can I share the harddisk between 2 computer?
Or I have to get 2 HD for 2 computer?

happygal wrote:
and can I put my other data on the external harddisk apart from the backup from time machine?
Absolutely. Yes. You will be limiting the space available for Time Machine though. The more space available, the further back your Time Machine backup trail can go.
Kryten

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Can I use one HD for 2 computer for time machine?

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