PC-based Partitions
Summary:
The type field in the partition identifies what type of data should exist in the partition.Common examples include FAT, NTFS, and FreeBSD. The next section has a more comprehensive list of partition types. The type value is used differently by different OSes. Linux, for example, does not care about it. You can put a FAT file system inside of a partition that has a type of NTFS, and it will mount it as FAT.Microsoft Windows, on the other hand, relies on it.Windows will not try to mount a file system in a partition if
it does not support the partition type. Therefore, if a disk has a FAT file system inside a partition with a Linux file system type, the user will not see the FAT file system from within Windows. This behavior can be used to hide partitions from Windows. For example, some tools will add a bit to a partition type that Windows supports so that it will not be shown when Windows boots again. Each entry also contains a flag field that identifies which partition is the “bootable” one. This is used to identify where the operating system is located when the computer is booting. Using the four entries in the MBR, we can describe a simple disk layout with up
to four partitions. Figure 5.1 shows such a simple disk with two partitions and the MBR in the first sector.
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PC-based Partitions