(8.3-RELEASE,9.1-BETA) Can't mount the partitions created via 4. 11-RELEASE

[Andrey V. Elsukov]

On 24.07.2012 19:18, Norihiko Murase wrote:
> does have 2 slices (FDISK partitions) as follows:
>   (1) sysid 165=0xA5 (FreeBSD)
>       flag  80 (active)
>       start 63, size 14801409 (7227 MB)
>       BSD partitions: a, b, c, e, f, g
>         - 'a' is for "root" of the 4.11-RELEASE system.
>   (2) sysid 165=0xA5 (FreeBSD)
>       flag  00
>       start 14801472, size 5242608 (2559 MB)
>       BSD partitions: c, e
>         - 'e' is used for /home
> Is this HDD under "dangerous dedicated" mode?

No, this is not DD mode. Probably, you did sometime `bsdlabel -w ad16`
and it has created metadata on the ad16.

> Before I start to erase (overwrite with zeroes) this, does
> the following (the dump of the second sector of this "old" HDD)
> match what you expect?

It will be good, if you would made backup of the first 16 sectors of the
ad16s1 too.

> Fixit# 
> Fixit# dd if=/dev/ad16 count=1 skip=1 | hexdump -C
> 1+0 records in
> 1+0 records out
> 512 bytes transferred in 0.000272 secs (1882107 bytes/sec)
> 00000000  57 45 56 82 05 00 00 00  77 64 30 73 31 00 00 00  |WEV.....wd0s1...|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000020  00 00 00 00 00 00 00 00  00 02 00 00 3f 00 00 00  |............?...|
> 00000030  ff 00 00 00 df 04 00 00  c1 3e 00 00 30 d9 31 01  |.........>..0.1.|
> 00000040  00 00 00 00 00 00 00 00  10 0e 01 00 00 00 00 00  |................|
> 00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 00000080  00 00 00 00 57 45 56 82  b4 21 08 00 00 20 00 00  |....WEV..!... ..|
> 00000090  00 20 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |. ..............|
> 000000a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 000000b0  00 00 00 00 30 d9 31 01  00 00 00 00 00 00 00 00  |....0.1.........|
> 000000c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

So, there is only empty bsdlabel with partition 'c'. You can see this
empty BSD label in the your geom config dump.

  <class id="0xc110a460">
    <name>PART</name>
    <geom id="0xc85d9b00">
      <class ref="0xc110a460"/>
      <name>ada0</name>
      <rank>2</rank>
      <config>
        <scheme>BSD</scheme>
        <entries>8</entries>
        <first>0</first>
        <last>20044079</last>
        <fwsectors>63</fwsectors>
        <fwheads>16</fwheads>
        <state>OK</state>
        <modified>false</modified>
      </config>
        <consumer id="0xc8626b40">
          <geom ref="0xc85d9b00"/>
          <provider ref="0xc84b6c80"/>
          <mode>r0w0e0</mode>
          <config>
          </config>
        </consumer>
    </geom>
  </class>

Your MBR contains two slices ad16s1 and ad16s2, ad16s2 contains 2
partitions 'c' and 'e'. So, if you erase second sector of ad16 they all
should appear.

Note, in the FreeBSD 8.0+ partition 'c' is not visible, and default
partitioning tool is now gpart(8).

-- 
WBR, Andrey V. Elsukov

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