How do I set up a firewall with minimal disk access?

[Jonathon McKitrick]

Hi all,

I'm hoping to use an old laptop for a dialup firewall.  I'd like to leave it
always on as part of the network, but I don't want it to have the HD running
all the time.  If possible, I'd like it to work almost completely without
the drive.

How could I do this?

NOTE: Please CC me, as I am not currently subscribed.  Thanks.

jm
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My other computer is your windows box.