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If you have an idea of how about the contents of this file, this link may help:

Learn the DD command - LinuxQuestions.org...

When it's copied back, I get the same size file. When I view the contents of the file, it has got the last few hundred bytes of the jpg. The rest of the file is zero's that were placed on the...

Maybe an example will help narrow things this problem down.

I used a jpg to copy to make it easy to check for errors.

I copied the file to a usb memory stick with no partition table, (zeroed...

If I set bs to 1, like you say, wouldn't it then only read and write one byte per count? If I am not misled on this, the data would be copied slowly due to dd handling 1 byte per count iteration.
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I want to seek to a location on the hard drive that will be written to that is different from the output block size. Is this possible? It seems the man page implies you can only seek in increments...