D4) What can be done with hardware protection?

Hardware protection can accomplish various things, including: write
protection for hard disk drives, memory protection, monitoring and
trapping unauthorized system calls, etc.  Again, no tool is foolproof.

The popular idea of write-protection (see D3) may stop viruses
spreading to the disk that is protected, but doesn't, in itself,
prevent a virus from running.

Also, some of the existing hardware protections can be easily
bypassed, fooled, or disconnected, if the virus writer knows them
well and designs a virus which is aware of the particular defense.


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