VERIFY: Verify that a DSCB is a Format-0 DSCB

VERIFY=YES: CVAF verifies that the DSCB is a format-0 DSCB before writing the DSCB. The first four bytes of the key are compared with binary zeros. If the key does not start with 4 bytes of zeros, the DSCB is not written and an error code is returned.
VERIFY=NO: CVAF does not test the key of the DSCB. This is the default.

Restriction: VERIFY applies only when writing a 140-byte DSCB. VERIFY is ignored when a VIR is written.