When a partition table gets deleted, corrupted or lost in general, only its entry is removed from first sector of the hard drive; and although the data is no longer available, it still remains on the disk pending to get overwritten. Expert recovery tools can locate lost file systems even if partition table information is missing. Irrespective of the file system and operating system, partition table is always the first physical sector of a hard drive which starts from 0, 0 and 1 which means the 0th cylinder, a 0th head and the 1st sector.

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