Message-ID: <01FD6EC775C6D4119CDF0090273F74A455A852@emwatent02.meters.com.au>
From: "da Silva, Joe" <Joe DOT daSilva AT emailmetering DOT com>
To: "'opendos AT delorie DOT com'" <opendos AT delorie DOT com>
Subject: RE: Extended partitions (was: FDISK)
Date: Tue, 27 Nov 2001 12:29:16 +1100
MIME-Version: 1.0
X-Mailer: Internet Mail Service (5.5.2653.19)
Content-Type: text/plain
Reply-To: opendos AT delorie DOT com

I wonder is someone could perhaps clarify something that is
puzzling me about logical volumes in extended partitions :

As described earlier by Bob, these are a daisy chain of
"extended partition boot sectors". Does this mean that
each logical volume has an extended partition table sector,
akin to the MBR? If so, where are these sectors located on
the disk (eg. sector 2, etc. of the first track, perhaps)? Or
does this mean that logical volumes have their "partition
table" parameters stored in the "DOS boot sector" instead?

Joe.

> -----Original Message-----
> From:	Robert W Moss [SMTP:domanspc AT juno DOT com]
> Sent:	Friday, November 03, 2000 12:20 AM
> To:	opendos AT delorie DOT com
> Subject:	RE: FDISK
> 
	------ snip ------

> If a disk is set up with two or more partitions, FDISK shows only two
> total 
> DOS partitions:  the primary partition and the extended partition.  The 
> extended partition is then divided into logical DOS volumes, which are 
> partitions themselves .  FDISK gives a false impression of how the 
> partitioning is done.  FDISK reports that a disk divided as C, D, E, and
> F 
> is set up as two partitions ,  with a primary partition having a volume 
> designator C and a single extended partition containing logical DOS 
> volumes D, E, and F.  But in the real structure of the disk , each
> logical 
> DOS volume is a separate partition with an extended partition boot  
> sector describing it.  Each drive volume constitutes a separate partition
> 
> on the disk,  and the partitions point to one another in a daisy-chain 
> arrangement.  
> 
	------ snip ------