Walter, > Kees, Ted, Terry, > > thanks very much for your reply. I first looked at 'z/OS 1.9 DSMS > Using Data Sets', > but could not find such a direct statement. I will pass this info to > our programmers > and see how Natural can make a better use of blksize when data is > written to tape. > It is very possible that Natural is using the dcb exit that I mentioned in my other email. Hopefully, the means and values are documented somewhere and even better, changeable. Regards, John
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