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FAT is an abbreviation of File Allocation Table which is a computer file system architecture, it is used on computer systems and memory cards. FAT describes which clusters (the unit used by file allocation) are used by which files. There are three types of FAT: FAT12, FAT 16 and FAT 32:
A FAT12 file system contains 1.5 bytes per cluster within the file allocation table and the amount of data clusters is less than 4087 clusters.
A FAT16 file system contains 2 bytes per cluster within the file allocation table and the amount of data clusters is between 4087 and 65526 clusters, inclusive.
A FAT32 file system includes 4 bytes per cluster within the file allocation table and the amount of data clusters is between 65526 and 268,435,456 clusters, inclusive.
Most situation of FAT partition data loss is unforeseen, for example, deleting a file or program accidentally or mistakenly, deleting data intentionally but find they are still useful later, improper computer shut down, power failure, operating system corruption, data corruption, virus attack, etc.
1. When you find the FAT partition is inaccessible (the symptom is usually that the PC suggests that the partition is not formatted) or partition is lost when you are partitioning.
For this circumstance, your partition table is damaged by some errors, virus, and intentional active or unknown reasons. The data stored on the hard drive are still located where they used to be. You can recover your FAT partition table, and then get back your data.
For this circumstance, you can retrieve data from data recovery soft ware or manual data recovery.