Thank you for your reply Steve!
And thank you for the information you have provided!
I know I am kind of spoiled with having all of the manuals all online in one place, I can scan them easily using Control-F, it must be a lot easier now than it was back in the day when there was only one or two hard copy's to in one shop.
And my exact reason for posting this in the first place is because I realize how important it is to know how and where to find information. As a beginner in MVS I pretty much always need information
I feel like I am putting together the biggest jigsaw puzzle ever made, I just need to get all the pieces together so I have an understanding of zOS.
Can I just ask you a little more regarding directory blocks?
In relation to bytes per Tracks and directory blocks: there are 56,664 bytes per track, are all of these bytes used for data, or are some lost? According to your info about each block being 256 bytes, this would mean a track can fit 221.3 directory blocks, so I assume 3/10's of a directory block - 76.8 bytes would be lost?
I am trying hard to learn as much as possible, but also making sure anything I learn can be validated as correct knowledge. I was trying to figure out the most efficient space for a PDS, using LRECL of 80.
I really appreciate you taking the time to help me out.