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Other values that can be stored in a cluster’s entry in the FAT are special markers for:

  • End-of-cluster-chain: this cluster is the final cluster for a file.
  • Cluster-not-allocated (free cluster mark): no file is using this cluster.
  • Damaged-cluster: this cluster cannot be used.

NOTE: Updating the FAT table is time consuming, but updating it frequently is very important. If the FAT table gets out of sync with its files, files and directories can become corrupted, resulting in the loss of data (see section 12-6 “Optional Journaling System”).