Laptop Encryption & Write Permissions

I am looking into encryption for laptops.  Specifically, I like the idea
of only encrypting one of two partitions (the non-OS holding partition).
This partition would hold data and programs for the user, and the
unencrypted partition would hold the OS. =20 Is it simple permissions to
force users to write data (including swap and all temporary files) to
the encrypted partition?  Essentially, for the user the OS part would be
read only. 

Thanks!

Casey DeBerry
CoBiz Inc
Information Security
Office 303-312-3405
Mobile 303-669-8547
cdeberry@cobizinc.com=20

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