This comprehensive manual covers three areas in which system administrators must be proficient to successfully recover data: the structure and operating principles of the most popular file systems, automatic data recovery techniques, and manual recovery techniques used in cases of total data destruction. Data recovery from hard drives and optical storage in Windows, BSD, and Linux file systems is described, as are automatic recovery utilities, manual and automatic recovery of deleted files on ext2/ext3 partitions and NTFS partitions, formatted NTFS partitions and deleted UFS/FFS files, RAID data recovery, media restoration with physical damage, and data loss prevention.