Mac no longer recognizes internal hard disk. Months of work lost, presumably forever. I would have backed up data on external burner today. Dozens of alternate Gridcosm squares and hundreds of text files (about 500 megs worth) were ready for the burner. But I put burning off because I was hunting for the cause of what I thought was a minor problem. Norton AntiVirus gave me a clue when it mentioned a disk error. No mention of a virus, though. I think maybe the hard disk went bad. All of my diagnostic CD-ROMs now ask me the same question: DoI want to initialize the disk? I wonder if it's still under warranty? Expired yesterday, probably. A Seagate UltraSCSI, no less. Is it the second hard disk to bite the big one on this machine? The other one was a Western Digital IDE. I've had an hour and a half of sleep. What depresses me most is that I really don't care about the lost data. It was all crap anyway. I'll take this experience as a harsh lesson learned. Make frequent backups. I certainly will from now on. Who knows, maybe someday I'll create something worth saving.