Mike McCarty wrote:
[snip]
If an extended partition exists, then any number of logical
volumes may be created, space permitting.
Please allow me to reword that...
If an extended partition exists, then any number of logical
volumes be created within the extended partition, space
permitting.
[snip]
Sorry.
Each volume has a volume descriptor, the boot record (BR),
containing the BIOS Parameter Block (BPB). Some people prefer
to call the BPB the "geometry". Some refer to the BR as
the "geometry".
The first level of formatting, the physical or low level format,
lays down tracks and sectors. On modern drives, low level formatting
is no longer expected to be performed by end users.
The second level of formatting is partitioning. Floppies don't have
this level. This format is contained in the Master Boot Record (MBR)
of which there is at most one per drive. This level is optional
for hard discs, but if one wants multiple file systems on a
drive, then one must use this level.
The third level of formatting is the volume, which creates
logical volumes. Floppies and hard drives both have this.
It creates the Boot Record (BR), one per volume.
The fourth level of formatting is the file system. Each logical
volume may have up to one file system in it. (I'm neglecting
loopback type mounts here.)
The fifth level of formatting is application specific, and
defines the file type. Some OS supply predefined structured
files, UNIX like OS do not, leaving all database definitions
and the like to be application defined.
Mike
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