Perhaps this explains the observed action? http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IGY3LR31/5.2.4
<quote> BLOCK CONTAINS 0 can be specified for QSAM files. If BLOCK CONTAINS 0 is specified for a QSAM file, then: * The block size is determined at run time from the DD parameters or the data set label. If the RECORD CONTAINS 0 CHARACTERS clause is specified and the BLOCK CONTAINS 0 CHARACTERS clause is specified (or omitted), the block size is determined at run time from the DD parameters or the data set label of the file. For output data sets, with either of the above conditions, the DCB used by Language Environment will have a zero block size value. If you do not specify a block size value, the operating system might select a system-determined block size (SDB). See the operating system specifications for further information about SDB. </quote> -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html