Strange tapetype values with Sony SDT-9000

[Christoph Harrer]

Hi!

I have a Sony SDT-9000 tapedrive, which uses DDS3 (12GB) tapes and should 
operate with a speed of 1.2MB/s, but after a quite long tapetype-run I got 
the following values:

    length 9856 mbytes
    filemark 327 kbytes
    speed 961 kbytes

Does anyone know what the problem can be?

Thanks in advance!

Regards,
Christoph.