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Each 512 byte sector has a marker showing where it begins and an area dedicated to storing error correction codes. In addition a tiny gap has to be left between each sector. In large drives this wasted space where data cannot be stored can take up a significant proportion of the drive. Moving to an advanced format of 4K sectors means about eight times less wasted space but will allow drives to devote twice as much space per block to error...

2010-03-09

 sector hard drive storage