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Re: Weird bug -- non-integral sector number


From: Antonio Diaz Diaz
Subject: Re: Weird bug -- non-integral sector number
Date: Sat, 26 Aug 2023 16:40:08 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.9.1.19) Gecko/20110420 SeaMonkey/2.0.14

Franc Zabkar wrote:
The last two lines of the mapfile contain three numeric values which
don't make sense. That is, the numbers 0x0EBE8700, 0x1CD5A9A8700 and
0x464757900 are not integer multiples of the sector size, 0x200.

Thank you for reporting this.

Note that the values above do make sense. They are multiples 0x100, a valid value of sector size. Moreover, the positions and sizes of the mapfile blocks are not required to be multiples of the sector size.

Note also that the 'current_pos' (0x142D3A80000) is in the middle of the mapfile, indicating that ddrescue was already run on this mapfile before.

Maybe the user ran ddrescue previously with a --sector-size of 0x100.

Best regards,
Antonio.



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