Logical drive
A logical drive -- often also called a logical partition -- is a set of adjoining
sectors inside an extended partition. In many respects the logical drives resemble
primary partitions. However the boot loader in the standard MBR of Microsoft does not
support booting from logical drives. With the help of a boot manager a logical
drive can be easily booted, supposed the operating system allows itself to be installed on
a logical drive.
The size, position and type of logical drives is stored in a chain of partition sectors
inside the extended partition. The partition table of a logical partition sector
contains two entries. One entry describes the logical partition, the other entry contains
the position of the partition sector of the next logical drive. The entry in the
partition table of the MBR describes just the beginning of this chain. If the chain
is broken, the following logical drives will not be accessible any more.
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