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.\" $NetBSD: edahdi.1,v 1.11 2009/10/20 19:10:10 snj Exp $
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.\" $NetBSD: edahdi.1,v 1.12 2019/09/01 12:50:22 sevan Exp $
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.\"
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.\" Copyright (c) 1996 Leo Weppelman
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.\" All rights reserved.
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 16, 1996
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.Dd September 1, 2019
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.Dt EDAHDI 1 atari
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.Os
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.Sh NAME
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@ -35,16 +35,16 @@
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.Sh DESCRIPTION
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.Nm
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allows you to modify the partition identifiers on a disk partitioned with
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AHDI or an AHDI compatible formatter. An AHDI partition format is usually
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only present on disks shared between
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AHDI or an AHDI compatible formatter.
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An AHDI partition format is usually only present on disks shared between
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.Nx
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and some other OS. The partition identifiers are used by
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and some other OS.
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The partition identifiers are used by
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.Nx
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as a guideline to emulate a disklabel on such a disk.
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.Pp
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.Nm
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supports the following options:
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.Pp
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.Bl -tag -width device
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.It Ar device
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The name of the raw device you want to edit.
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@ -52,13 +52,12 @@ The name of the raw device you want to edit.
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.Pp
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The following partition identifiers are recognized by
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.Nx :
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.Pp
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.Bl -tag -width "GEM or BGM" -compact
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.It NBD
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Partition is reserved for
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.Nx .
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This can be either a root or an user partition. The first NBD
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partition on a disk will be mapped to partition
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This can be either a root or an user partition.
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The first NBD partition on a disk will be mapped to partition
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.Em a
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in
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.Nx .
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@ -72,7 +71,8 @@ The first SWP partition is mapped to partition
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.It GEM or BGM
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These partitions are mapped from
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.Em d
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up. The filesystem type is msdos.
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up.
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The filesystem type is msdos.
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.It NBR
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.Nx
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root partition (deprecated).
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@ -84,8 +84,7 @@ user partition (deprecated).
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swap partition (deprecated).
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.El
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.Sh EXAMPLES
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Say, you have a disk with that is partitioned like:
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.Pp
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Say, you have a disk that is partitioned like:
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.Bl -column Number Id
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.It Sy "Number" Ta Sy "Id"
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.It 1 Ta GEM
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This partitioning will show up in
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.Nx
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as (Number refers to the first table):
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.Pp
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.Bl -column "c (whole disk)" "Fstype" "Number"
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.It Sy Partition Ta Sy Fstype Ta Sy Number
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.It c (whole disk) Ta unused Ta ""
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.It g (user part) Ta MSDOS Ta 4
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.El
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.Pp
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Now you decide to change the id of partition 2 and 3 to NBD. Now
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Now you decide to change the id of partition 2 and 3 to NBD.
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Now
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.Nx
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will show the partitioning as (Number refers to the first table):
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.Pp
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.Bl -column "c (whole disk)" "Fstype" "Number"
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.It Sy Partition Ta Sy Fstype Ta Sy Number
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.It a (root) Ta 4.2BSD Ta 2
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.El
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.Pp
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You will notice that the order of the partitions has changed! You will have
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to watchout for this. It is a consequence of
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to watchout for this.
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It is a consequence of
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.Nx
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habit of assigning a predefined meaning to the partitions
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.Em a/b
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.Sh BUGS
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The changes made to the AHDI partitions will become active on the next
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.Em first open
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of the device. You are advised to use
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of the device.
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You are advised to use
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.Nm
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only on a device without any mounted or otherwise active partitions. This
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is not enforced by
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only on a device without any mounted or otherwise active partitions.
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This is not enforced by
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.Nm .
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This is particularly confusing when your change caused partitions to shift,
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as shown in the example above.
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