Browsing a data set does not lend itself to tape data sets unless the data set is moved to DASD, because a tape...
data set is a sequential data set. If you wanted to jump from the start of a data set to somewhere near the end of the data set, you would have to sequentially read through all the intervening data on the tape, and if you then wanted to scroll backwards, you would have to read the tape backwards. Moving the data set to DASD makes it a direct access data set, and in the process makes it a much easier data set to browse, since you can go directly to the data you wish to browse.
Related Q&A from Jim Schesvold
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