Answer / giri reddy

F-fixed unblocked,fb-fixed blocked
v-variable unblocked,vb-variable blocked

default value is u-undefined

we can see the description of data set.

Answer / arthi

DCB=(RECFM=F,LRECL=80,BLKSIZE=800)

RECFM - to specify the record format
F-Fixed length record
V-Variable length record
FB-Fixed Block
VB-Variable Block
U-Undefined

for fixed length record the BLKSIZE is multiple of LRECL. For variable length records, BLKSIZE is multiple of (largest record+4)

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