It might be a good idea to look at the tape device configuration parameters. Depending on the tape device utilities installed, it might be possible to look at and change some of the configuration parameters such as block size, maximum number of blocks and end of tape marker. An erroneous maximum number of blocks or end-of-tape configuration could very well limit the amount of data that can be written to tapes mounted in a particular device.
It would be advisable to contact the tape device vendor to determine how the device's configuration parameters can be changed if a utility is not available.
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