From owner-freebsd-questions  Wed Sep  2 17:06:57 1998
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Date: Wed, 02 Sep 1998 18:02:21 -0600
To: Dan Nelson <dnelson@emsphone.com>, sab@seanet.com
From: Brett Glass <brett@lariat.org>
Subject: Re: MSDOS extended partitions and "slices"
Cc: Doug White <dwhite@resnet.uoregon.edu>, questions@FreeBSD.ORG
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At 05:56 PM 9/2/98 -0500, Dan Nelson wrote

>Sure it's logical.  FDISK slices are always numbers; disklabel
>partitions are always letters.

DOS logical drives are not slices! They're the equivalent of
disklabel partitions and should have letters at the end.

--Brett

>
>wd1s1  .. wd1s4 are the four primary fdisk slices.  Any or all of them
>MAY be a container (i.e. extended partition type).  If any of them are,
>then they are scanned for valid partition entries (including more
>nested extended partitions), and any of those will appear at wd1s5, s6,
>etc.  The kernel sets an arbitrary limit of 32 of these slices.
>
>So say you had a mythical 14G IDE drive partitioned with FAT16 DOS
>drives:
>
>+--------+-----------------------------------------------------+
>|   C:   |                 extended  partition                 |
>+--------+- - - - + - - - -+- - - - + - - - - - - - - - - - - -+
>         |   D:   |   E:   |   F:   |      extended part.      |
>         +--------------------------+ - - - - - - - - - - - - -+
>                                    |   G:   |   H:   |   I:   |
>                                    +--------------------------+
>
>(boy, I respect Terry more now.  Drawing ascii-art isn't easy :)
>
>In your naming scheme, what would drive 'G:' be?  wd1s2da ?  FreeBSD
>would name them like this (after looking at the code in
>diskslice_machdep.c; I could be wrong):
>
>wd1s1  C:
>wd1s2  extended partition container #1
>wd1s3  empty
>wd1s4  empty
>wd1s5  D:
>wd1s6  E:
>wd1s7  F:
>wd1s8  extended partition container #2
>wd1s9  G:
>wd1s10 H:
>wd1s11 I:
>
>	-Dan Nelson
>	dnelson@emsphone.com


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