Some ideas...
Verify that the length of the block is correct on disk, it should be same as
BDW. Here's an example of a single VB LRECL=84 record with 4 bytes of data
(TEST). It shows that the block length is 12:
CYL-HD-REC 0000044 07 000 Extent 1 of 1 Col 1 Format HEX
Volume V9W008 7109 3390 DSNAME TTPJMSS.VBIOERR
Search limit *
Rec Type Len ----+----10---+----2----+----3----+----4----+----5----+----6
************** Begin of track CYL:44 HD:7 *********************************
1 DATA 12 CHAR ········TEST
ZONE 00000000ECEE
NUMR 0C0008003523
1 ----+----1--
Some error messages will go to the output of your TSO session's job, look in
SDSF or equivalent. Your site may be using a message class that is not visible,
so if so, change the message class.
Make sure the ISPF log is enabled (Settings > Log/List > Log Data set defaults,
primary pages needs to be > 0. After the problem, view the log in 7.5.
Some messages go to SYSOUT or SYSPRINT, make sure both are allocated to the
terminal.
You may need to get ISPF to produce a dump. Make sure you have the appropriate
dump DDs allocated, and in Settings > Environ > Environ Settings, select
"Enable a dump for a subtask abend when not in ISPF TEST mode". Or, it may be
sufficient to run your test from Dialog Test, because that puts you in test
mode.
Or, can you send us the problem file?
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Joseph Reichman
Sent: Tuesday, January 13, 2026 1:17 PM
To: [email protected]
Subject: I/O error in ISPF in VB file
Hi
I have a VB file that I use bsam to write to
The RDW contains length of record + 4
BDW contains the RDW + 4 as there is only one record
The write and check come back ok
However trying to browse this file in ISPF
I get an I/O error
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