|You should format it. |
He needs to use fuse nfts3g or macfuse to apply files to that drive.
There might be a widows driver to view hpfs file systems if they still use that.
Otherwise both go to a common linux format maybe.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10