| Sectors are the smallest units capable of being accessed on a hard disk. Every single platter on a hard disk is split into tracks that run in a circular pattern round it, as they get bigger as the track moves from the inside of the disk towards the outside. This means that there are more sectors on a disk near the outside, the variance that occurs in every track is known as "zoned-bit recording". A file that is particularly large will take up thousands of these sectors, and physical damage to even one of them can leave the file unable to be read. This kind of physical damage cannot be corrected as a disk utility program can only fix corrupted data. A computer is capable of recognising and skipping these "bad sectors" however it may still not make the disk run correctly. This is another reason that it is important to back up your data. |
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