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TechTalk: Your tape density may not be what you expect.

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I used the Initialize Tape (INZTAP) command to initialize a tape to 1600bpi and then used the Copy To Tape (CPYTOTAP) command to put data on the tape. Much to my surprise, when I dumped the tape, I found that the tape was initialized to 6250bpi instead of 1600bpi.

The CPYTOTAP command doesn't allow you to specify the density; it uses the density of the tape file you specify in the TOFILE parameter (QTAPE in my case). QTAPE is a default tape data device file found in QGPL library with the density set to *DEVTYPE, which in our case is 6250.

To get around the problem, I created a new tape file and specifically set the density to 1600bpi. I then referenced the new tape file in the TOFILE parameter of the CPYTOTAP command.

- Sharla Tolleson

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