GNU logs - #20746, boring messages

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Subject: bug#20746: problem with non-LBA fat16
Resent-From: George Hicken <george.hicken@HIDDEN>
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Date: Fri, 5 Jun 2015 10:36:01 -0700
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Requested output prior to partitioning

Error: /dev/sdb: unrecognised disk label
Error: /dev/sdb: unrecognised disk label
Error: /dev/sdb: unrecognised disk label
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 16777216s
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 1044,85,0
Sector size (logical/physical): 512B/512B
BIOS cylinder,head,sector geometry: 1044,255,63.  Each cylinder is 8225kB.
Partition Table: unknown
Disk Flags:

Using the parted supplied with tinycorelinux 6.x (reports as 3.1) to create
an MBT, create a primary fat16 parition with non-lba addressing
   /usr/local/sbin/parted -a cylinder -s /dev/sdb --  mklabel msdos mkpart
primary fat16 1cyl 40MiB

This produces a partition of type 0xe, but otherwise it's what we want -
interestingly parted print command doesn't detail the parition type, it's
all blank. Using "set 1 lba off" then does something entirely unexpected.
Using fdisk to inspect the partition table the type has switched to 0x83.

I took a quick look at the code and 0x83 appears to be the default fstype
if none is set. Why this happens when setting lba off on a fat16 partition
I have no idea.

Thanks.

George

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<div dir=3D"ltr">Requested output prior to partitioning<div><br><div><div>E=
rror: /dev/sdb: unrecognised disk label</div><div>Error: /dev/sdb: unrecogn=
ised disk label</div><div>Error: /dev/sdb: unrecognised disk label</div><di=
v>Model: VMware Virtual disk (scsi)</div><div>Disk /dev/sdb: 8590MB</div><d=
iv>Sector size (logical/physical): 512B/512B</div><div>Partition Table: unk=
nown</div><div>Disk Flags:</div><div>Model: VMware Virtual disk (scsi)</div=
><div>Disk /dev/sdb: 16777216s</div><div>Sector size (logical/physical): 51=
2B/512B</div><div>Partition Table: unknown</div><div>Disk Flags:</div><div>=
Model: VMware Virtual disk (scsi)</div><div>Disk /dev/sdb: 1044,85,0</div><=
div>Sector size (logical/physical): 512B/512B</div><div>BIOS cylinder,head,=
sector geometry: 1044,255,63.=C2=A0 Each cylinder is 8225kB.</div><div>Part=
ition Table: unknown</div><div>Disk Flags:</div></div><div><br></div></div>=
<div>Using the parted supplied with tinycorelinux 6.x (reports as 3.1) to c=
reate an MBT, create a primary fat16 parition with non-lba addressing</div>=
<div>=C2=A0 =C2=A0/usr/local/sbin/parted -a cylinder -s /dev/sdb -- =C2=A0m=
klabel msdos mkpart primary fat16 1cyl 40MiB=C2=A0<br></div><div><br></div>=
<div>This produces a partition of type 0xe, but otherwise it&#39;s what we =
want - interestingly parted print command doesn&#39;t detail the parition t=
ype, it&#39;s all blank. Using &quot;set 1 lba off&quot; then does somethin=
g entirely unexpected. Using fdisk to inspect the partition table the type =
has switched to 0x83.</div><div><br></div><div>I took a quick look at the c=
ode and 0x83 appears to be the default fstype if none is set. Why this happ=
ens when setting lba off on a fat16 partition I have no idea.</div><div><br=
></div><div>Thanks.</div><div><br></div><div>George</div></div>

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To: George Hicken <george.hicken@HIDDEN>
Subject: bug#20746: Acknowledgement (problem with non-LBA fat16)
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Date: Fri, 05 Jun 2015 17:53:02 +0000

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Message sent to bug-parted@HIDDEN:

Subject: bug#20746: problem with non-LBA fat16
Resent-From: Phil Susi <psusi@HIDDEN>
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On 6/5/2015 1:36 PM, George Hicken wrote:
> Requested output prior to partitioning
>
> Error: /dev/sdb: unrecognised disk label
> Error: /dev/sdb: unrecognised disk label
> Error: /dev/sdb: unrecognised disk label
> Model: VMware Virtual disk (scsi)
> Disk /dev/sdb: 8590MB
> Sector size (logical/physical): 512B/512B
> Partition Table: unknown
> Disk Flags:
> Model: VMware Virtual disk (scsi)
> Disk /dev/sdb: 16777216s
> Sector size (logical/physical): 512B/512B
> Partition Table: unknown
> Disk Flags:
> Model: VMware Virtual disk (scsi)
> Disk /dev/sdb: 1044,85,0
> Sector size (logical/physical): 512B/512B
> BIOS cylinder,head,sector geometry: 1044,255,63.  Each cylinder is 8225kB.
> Partition Table: unknown
> Disk Flags:

What are the exact commands that lead to this?  What does parted 
/dev/sdb print show?  What does fdisk show?

> Using the parted supplied with tinycorelinux 6.x (reports as 3.1) to create

Please try again with 3.2.

> an MBT, create a primary fat16 parition with non-lba addressing
>     /usr/local/sbin/parted -a cylinder -s /dev/sdb --  mklabel msdos mkpart
> primary fat16 1cyl 40MiB

Do you mean to say that this is the command that produced the above output?

> This produces a partition of type 0xe, but otherwise it's what we want -
> interestingly parted print command doesn't detail the parition type, it's
> all blank. Using "set 1 lba off" then does something entirely unexpected.
> Using fdisk to inspect the partition table the type has switched to 0x83.
>
> I took a quick look at the code and 0x83 appears to be the default fstype
> if none is set. Why this happens when setting lba off on a fat16 partition
> I have no idea.

This is because as you noted, 0x83 is the default type.  Since you did 
not actually format a fat16 filesystem within the partition, parted 
can't detect any filesystem there and so does not know that it should 
use the type code for fat16.

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