FAT12 used 12-bit entries for the cluster addresses; some values were reserved to mark the end of a chain of clusters, to mark unusable areas of the disk, or for other purposes, so the maximum number of clusters was limited to 4078.[22][23] To conserve disk space, two 12-bit FAT entries used three consecutive 8-bit bytes on disk, requiring manipulation to unpack the 12-bit values. This was sufficient for the original floppy disk drives.
https://en.wikipedia.org/wiki/File_Allocation_Table#FAT12
FAT12 utilisait des entrées de 12 bits pour les adresses de cluster ; certaines valeurs étaient réservées pour marquer la fin d'une chaîne de clusters, pour marquer les zones inutilisables du disque, ou à d'autres fins, de sorte que le nombre maximal de clusters était limité à 4 078. [ 22 ] [ 23 ] Pour économiser de l'espace disque, deux entrées FAT de 12 bits utilisaient trois octets consécutifs de 8 bits sur le disque, nécessitant une manipulation pour décompresser les valeurs de 12 bits.
https://en.wikipedia.org/wiki/File_Allocation_Table#FAT12
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