On Mon, 10 Aug 2009 16:55:31 -0400, Bill Fairchild wrote: >You have always been able to write a block of only one byte, or even zero >bytes, onto a DASD. > I thought a count of zero was prohibited in a CCW. (But there may be other ways.)
As for the minimum of 18 for tape, how does the access method deal with a program that does RECFM=VB; OPEN PUT RDW has count of 4; CLOSE; which would generate an 8-byte block. This might easily happen inadvertently if a preceding block was filled and the 8-byte (or up to 17-byte) block was the last block written before CLOSE. If RECFM=VBS, the access method _could_ pad with a null segment, but I don't know that null segments are allowed for non-Spanned RECFM. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
