Re: Partitions not detected

[Ignaz Forster]

Jim Meyering schrieb am 10.01.2011 10:05 Uhr:
> Ignaz Forster wrote:
>> I fear I need some help with Parted.
>> The two partitions of a disk are not detected, instead a message about
>> a third partition is printed:
>>
>>
>>> # parted /dev/sdc unit s print
>>> No Implementation: Partition 3 isn't aligned to cylinder boundaries.
>>> This is still unsupported.
>>
>>
>> If I remember correctly the disk was partitioned using cfdisk, using
>> byte values (instead of sectors) to specify the partition sizes. fdisk
>> reports the following layout:
>>
>>
>>> # fdisk -l -u /dev/sdc
>>>
>>> Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
>>> 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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
>>> Disk identifier: 0x14762e21
>>>
>>>    Device Boot      Start         End      Blocks   Id  System
>>> /dev/sdc1              63   976559219   488279578+  83  Linux
>>> /dev/sdc2       976559220  1953520064   488480422+  83  Linux
>>
>>
>> The first partition contains a XFS, the second one a JFS filesystem.
>>
>> If my calculation is right at least the first partition should be
>> aligned to cylinder boundaries, but temporarily deleting the second
>> partition did not help either.
>> Any hint why Parted doesn't see those partitions?
> 
> Thanks for the report, but what version of parted are you using?

Sorry, I forgot to write that: I've tried both 2.2 and 2.3 with the same result.

> If you're using a relatively recent version of parted,
> then the fact that you're seeing that diagnostic means
> that device has a PC98 partition table (or at least that
> parted detects it as such -- which may be a bug in parted).
> [...]
> 
> If you are using one of those, please make a copy of
> the first few sectors of your disk and send them to this list.
> I.e., you could run this and then attach the file F:
> 
>     dd if=/dev/sdc count=34 > F
> 

This is interesting. The dump contains the string "Apple_partition_map" - see 
the attached file.
The disk was advertised with it's Mac compatibility and originally contained a 
HFS file system which was deleted (as far as I remember also using cfdisk) to 
create the new partitions / filesystems.

Greetings,
-- 
Ignaz Forster <address@hidden>

F
Description: Binary data

signature.asc
Description: OpenPGP digital signature