Chance of equal checksum and changing blocks

David de Lama david.delama at
Tue Jan 27 11:05:09 GMT 2009

-----Ursprüngliche Nachricht-----
Von: "Paul Slootman" <paul+rsync at>
Gesendet: 27.01.09 11:25:31
An: rsync at
Betreff: Re: Chance of equal checksum and changing blocks

On Tue 27 Jan 2009, David de Lama wrote:
> Then I wanted to overwrite 25 blocks:
> dd bs=1M if=/dev/urandom of=/home/ seek=50 count=25
> But when I look at the file, its size is now 76.8MB! So all the Blocks after block 75 are deleted! :(
> Need help, please!

Try the dd manpage, which mentions:
           convert the file as per the comma separated symbol list
    Each CONV symbol may be:
           do not truncate the output file

Hence try adding conv=notrunc

Paul Slootman

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