Filesystem Codes
So far I've discussed OSs accessing partitions containing filesystems that they understand as if the task of identifying compatible partitions were magic. It's not, of course. Depending on the OS and filesystem type, several common methods of identification are available. These methods interact with the partition hiding techniques as implemented by many boot loaders. Understanding the methods used by OSs to identify the partitions they use can help you manipulate that process, if necessary.
Identifying a Partition's Format
OSs employ three main methods to identify the type of filesystem contained on a partition:
Filesystem type codes— The partition tables in the MBR and extended partition contain special codes that are used ...
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