GNU bug report logs - #25233
hybrid iso reports 4x disk size with 2k sectors

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From: Bjørn Forsman <bjorn.forsman <at> gmail.com>
To: Phil Susi <psusi <at> ubuntu.com>
Cc: 25233-done <at> debbugs.gnu.org
Subject: bug#25233: parted is confused by ISO images, miscalculates sizes/offsets
Date: Tue, 18 Apr 2017 18:08:09 +0200

On 18 April 2017 at 17:23, Phil Susi <psusi <at> ubuntu.com> wrote:
> On 12/19/2016 7:19 AM, Bjørn Forsman wrote:
>> Hi all,
>>
>> [My name is Bjørn Forsman, end user of parted, I'm using parted as my
>> primary partitioning tool.]
>>
>> When I run parted (latest version, 3.2) on an ISO file, it gets
>> confused about the block size:
>>
>>   $ parted ubuntu-16.04-desktop-amd64.iso p
>>   WARNING: You are not superuser.  Watch out for permissions.
>>   Warning: The driver descriptor says the physical block size is 2048
>> bytes, but Linux says it is 512 bytes.
>>   Ignore/Cancel?
>
> This is because the image contains a mac partition table using a block
> size of 2048 bytes since the image is meant to go on a cdrom, which has
> a sector size of 2048 bytes.
>
>> If I select "Ignore", it misinterprets the size and the partition table:
>>
>>   Model:  (file)
>>   Disk /home/bfo/Downloads/ubuntu-16.04-desktop-amd64.iso: 5944MB
>>   Sector size (logical/physical): 2048B/512B
>>   Partition Table: mac
>>   Disk Flags:
>>
>>   Number  Start   End     Size    File system  Name   Flags
>>    1      2048B   6143B   4096B                Apple
>>    2      1479MB  1481MB  2425kB               EFI
>
> No; that is correctly interpreting the partition table.

Ok. Maybe I was wrong about the parition table (don't know what I
expected). But the size of the image (5944MB) is wrong. The real file
is 1.5GB.

Best regards,
Bjørn Forsman

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