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CorrectnessCorrectnessPosted Dec 15, 2008 21:06 UTC (Mon) by grundler (subscriber, #23450)In reply to: Correctness by ncm Parent article: Tux3: the other next-generation filesystem
ncm wrote:
> There's a widespread myth (originating where?!) that disks > detect a power drop and use the last few milliseconds to do > something safe, such as finish up the sector they're writing. > It's not true. A disk will happily write half a sector and scribble trash.
It was true for SCSI disks in the 90's. The feature was called "Sector Atomicity". As expected, there is a patent for one implementation:
AFAIK, every major server vendor required it. I have no idea if this was ever implemented for IDE/ATA/SATA drives. But UPS's became the norm for avoiding power failure issues.
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