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Journaling no protection against power drop

Journaling no protection against power drop

Posted Sep 1, 2009 23:28 UTC (Tue) by dododge (subscriber, #2870)
In reply to: Journaling no protection against power drop by ncm
Parent article: Ext3 and RAID: silent data killers?

> They say they happily stop writing halfway in the middle of a sector, and respond to power drop only by parking the head.

The old DeskStar drive manual (circa 2002) explicitly stated that power loss in the middle of a write could lead to partially-written sectors, which would trigger a hard error if you tried to read them later on. According to an LKML discussion back then, the sectors would stay in this condition indefinitely and would not be remapped; so the drive would continue to throw hard errors until you manually ran a repair tool to find and fix them.


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