Re: dd in cygwin vs dd in linux - number of records is always different

[Chris January <chris at atomice dot net>]

On Mon, Feb 9, 2009 at 5:18 PM, Corinna Vinschen wrote:
> I guess I'll ask on one of the Microsoft newsgroups if this is a known
> effect and especially what I'm doing wrong or what I have to do to
> get the desired behaviour.
>
> Btw., if anybody has an idea what's going wrong, please speak up :}

Maybe this excerpt from the CreateFile documentation applies?
"Note  To read or write to the last few sectors of the volume, you
must call DeviceIoControl and specify FSCTL_ALLOW_EXTENDED_DASD_IO.
This signals the file system driver not to perform any I/O boundary
checks on partition read or write calls. Instead, boundary checks are
performed by the device driver."

Chris

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