1) Auto repair function of the disks. They don't actually repair the BS, but they try to checksum it, and make sure the data remains valid. Working some of the time, if you happen to have a real bad sector.Actually, they do more than that. They copy whatever they can figure out of the data on the sector to another sector, and logically map the old sector to a new one. In other words, trying to continue reading the old sector will result in the new sector being read instead. Modern harddisks come with certain amount of space pre-reserved for that purpose. Also, the disk has considerably better chances of getting the previous sector data, as they do all sorts of low-level tricks, such as shifting the track a little and such
There is one thing to consider, however. The remapping is usually only done when the bad sector is written to.
-- Shachar Shemesh Lingnu Open Source Consulting http://www.lingnu.com/
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