Re: /dev/loop

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On 07/13/2017 05:11 PM, Patrick Dupre wrote:
> 
> 
> ===========================================================================
>  Patrick DUPRÉ                                 | | email: pdupre@xxxxxxx
>  Laboratoire de Physico-Chimie de l'Atmosphère | |
>  Université du Littoral-Côte d'Opale           | |
>  Tel.  (33)-(0)3 28 23 76 12                   | | Fax: 03 28 65 82 44
>  189A, avenue Maurice Schumann                 | | 59140 Dunkerque, France
> ===========================================================================
> 
> 
>>>
>>> I guess that it is an issue with the partition table.
>>> I have 3 disks in teh same machine.
>>> Yesterday I turned on the machine and turn it on this morning.
>>> I could not boot. Then I decided to mount them in an
>>> external USB enclosure. They all behave the same
>>
>> Ok, I'm a bit confused here. Do you mean that you install one drive at a
>> time into a USB enclosure to test?
> 
> Yes, on another machine
> 
> I tried to recover the partition table for 1 disk.
> I worked, but there are plenty of issues.
> 
> Disk /dev/sdd: 232.9 GiB, 250059350016 bytes, 488397168 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: dos
> Disk identifier: 0x00000000
> 
> Device     Boot     Start       End   Sectors   Size Id Type
> /dev/sdd1  *     24981075  36258704  11277630   5.4G  7 HPFS/NTFS/exFAT
> /dev/sdd2        36258705  46508174  10249470   4.9G  7 HPFS/NTFS/exFAT
> /dev/sdd3        60030976 206895103 146864128    70G 8e Linux LVM
> /dev/sdd4       206895104 488396799 281501696 134.2G  f W95 Ext'd (LBA)
> /dev/sdd5       206899200 290785279  83886080    40G 8e Linux LVM
> /dev/sdd6       317001728 405065727  88064000    42G 83 Linux
> 
> As you can see this table is wrong
> 
> But cannot mount /dev/sdd6 for example.
> Disk /dev/sdd6 - 45 GB / 41 GiB - CHS 5481 255 63

Well, yes. A DOS disk (not-GPT) can only have four primary partitions.
If you're going to have more than four, then at least one must be
an extended partition (typically the fourth partition or /dev/sdd4) and
any partitions above 4 live INSIDE partition 4. In the above example,
/dev/sdd4 should be type 5 (EXTENDED), then /dev/sdd5 and /dev/sdd6
would live inside /dev/sdd4.

In some ways, that makes sense in that /dev/sdd4 is the biggest
partition and could hold sdd5 and sdd6, but I have no idea what this
stuff looked like before. Anything I say would be a wild guess. Also the
mixture of straight Linux (type 83) and LVM (type 8e) partitions is
worrying. Again, without knowing how things were laid out before makes
any advice I offer dangerous.

> The harddisk (45 GB / 41 GiB) seems too small! (< 60 GB / 56 GiB)
> Check the harddisk size: HD jumpers settings, BIOS detection...
> 
> The following partition can't be recovered:
>      Partition               Start        End    Size in sectors
>>  Linux                 1889  40  8  7370 226 24   88064000 [Backup]
> 
>>
>>>
>>> testdisk
>>> Partition sector doesn't have the endmark 0xAA55
>>>
>>> Disk /dev/sdc: 232.9 GiB, 250059350016 bytes, 488397168 sectors
>>> Units: sectors of 1 * 512 = 512 bytes
>>> Sector size (logical/physical): 512 bytes / 512 bytes
>>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>>>
>>> I never though that I could lost 3 disks at the same time.
>>> I have a copy of the partition table on the disks.
>>>
>>> I am trying to run testdisk
>>
>> How? Via a rescue CD or something? I'm not familiar with testdisk but I
>> see it's available on a bunch of rescue CD images.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
-                                                                    -
-  You know the old saying--any technology sufficiently advanced is  -
-               indistinguishable from a Perl script                 -
-                                 --Programming Perl, 2nd Edition    -
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