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Re: 28-bit LBA limit and dd

From: Pádraig Brady
Subject: Re: 28-bit LBA limit and dd
Date: Fri, 06 Nov 2009 09:40:11 +0000
User-agent: Thunderbird (X11/20071008)

address@hidden wrote:
> Hi,
> I have a question according to the 28-bit LBA limit and the GNU dd tool.
> The english Wikipedia states, that Seagate warns, that GNU dd may fail to 
> opperate files/images larger than 128GB due to the mentioned old 28-bit LBA 
> limit. I searched today a lot on the web, but didn't find any hint, whether 
> this affects the current version of dd.
> Unfortunately I have no insights in the innards of the GNU coreutils, and how 
> they exactly work.
> So, is the current version of dd capable of creating disk images larger than 
> 128GB?

dd should be able to stream aribtrary amounts of data.
For seeking etc. it uses off_t internally which is 63 bits on my system

$ printf "%'d\n" $((2**63-1))

Your file systems and block devices will have lower limits.


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