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Q: How to force uncataloged?

Answer:
VOL=SER=volume forces uncataloged access. DISP=(OLD,KEEP). System searches specified volume, not catalog. UNIT required. Bypasses catalog entirely. Useful for specific volume access. Security still applies.
uncataloged vol access
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Q: What causes NOTCAT error?

Answer:
NOTCAT means dataset not in catalog. Check: correct DSN spelling, dataset was cataloged, catalog searched is correct. Use DISP=SHR only for cataloged datasets. DISP=OLD with VOL=SER for uncataloged. LISTCAT verifies catalog entry.
notcat catalog error