[brlug-general] 3d Seismic data SEG-Y stuff

[Tim Fournet]

Strange that you wouldn't get anything out of a dd, even if it was in a 
different format.
I've heard that what happens sometimes is an older tape drive will get 
out of alignment. When this happens, the drive can still read and write 
backups to its own tapes, but when you go to read them in a different, 
but supposedly compatible drive, they won't read. If you can try the 
original tape drive, you may get better results. Don't know if that's 
the case for you, but if it's possible, it might be worth a try.

-Tim

Shannon Roddy wrote:
> Anyone here ever do any work with 3d seismic data, as in oil
> exploration surveys.  Someone I know has 4 data tapes (8mm 112m tapes)
> that we tried reading in an exabyte drive on Linux.  dd wouldn't even
> take a bit for bit image of the tape.  Does anyone know if the oil
> industry uses something special to write these tapes?  After some
> googling we suspect that the files are written to the tape in an
> industry standard known as SEG-Y that has been around since the 70s.
> There is even some software for Linux we dug up that should have read
> the files, however I think we are dealing with a tape format
> incompatibility.  Anyone have a clue?
>
> Thanks,
> Shannon
>
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