At 12:13 PM -0700 3/27/2010, Jeffrey Engle wrote:
so, unplugging your computer while it's on has no affect on it? (outage)
From a hardware POV - a clean power drop (no spikes etc) is just fine. That would be exactly how the system powers itself off. The OS tells the PMU to shutdown and the PMU flips the gate on the power supply *thud*.
From a software POV ... Timing is everything, of course. A sudden power loss means that the dirty caches weren't written to a hard drive. If it was file data - oh well. If it was file system data (directories, inodes, etc), OS X will automatically replay the Journal to fix it. Note that the file systems used by Windows, FAT and NTFS, are particularly vulnerable to cache-write failures. That's why so many companies make billions selling drive repair and defragmentation tools to PC users.
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