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It makes a map of the hard disk, floppy or any other logical drive.
This is used for example with a database that stores its data and journal on different logical drives.
The process is reversed to convert a primary partition to a logical drive.
Starting from version 3.0 the system also supported mounting disk images as logical drives.
Instead, "logical drives" (aka volumes) must be created within them.
Creating a logical drive can already be done with DOS commands.
Therefore most systems have their drives partitioned into multiple logical drives.
The latter allows me to pool several disks into a single logical drive, which sounds a lot like what is being described here...
Using this technique it is possible to convert logical drives to primary partitions and vice versa.
The following output of a command line tool shows the layout of a disk with two logical drives.
The entire logical drive or partition may optionally be scanned for defects, which may take considerable time.
Logical drives require two lines minimum.
Generally the only time primary partitions are required (as opposed to logical drives) is to install certain operating systems (like Windows).
These logical drives must be kept in-sync on the replica if data-consistency needs to be preserved.
The sixth partition would then correspond to the second logical drive, or in other words, the extended partition containers are not counted.
This formatting includes the data structures used by the OS to identify the logical drive or partition's contents).
If the meta-data are lost, so is all the actual data as it would be virtually impossible to reconstruct the logical drives without the mapping information.
The fifth partition in this scheme, e.g., , corresponds to the first logical drive.
It is used to create, change, or delete a volume label on a logical drive, such as a hard disk partition or a floppy disk.
However there is another possible problem with converting primary partitions into logical drives, unless the primary partitions are made for this purpose.
This is like a distant relative of RAID because the logical drive is made of different physical drives.
(However, to create an extended partition any partition editor must put extended boot records before each logical drive on the disk.)
This makes it impossible to add a partition when the partition table has approximately 3 primary partitions, plus an "extended partition" with 28 logical drives.
In April 1987, PC DOS/ 3.30 added support for extended partitions, which could hold up to 23 "logical drives" or volumes.
If there is more than one extended partition in a partition table, only the logical drives in the first recognized extended partition type are processed.