IBM Mainframe Forum

I have typed the statement SPACE=(100,(80,10),RLSE), but in the properties of the dataset only 78 blocks are allocated. why is this so?

Two blocks were unused and therefore released.

Space is always allocated in track units. Your SPACE directed the system to allocate enough space for 100 80 byte records, which works out to 2 3390 tracks. You actually used less than 2 tracks, so the last track was released. One track can hold 78 80 byte records, which is why ISPF reports 78 blocks.

Sorry, I meant to say 80 100 byte records; it's still 2 3390 tracks. You actually used 1 track, which is the equivalent of 78 100 byte records, which is what ISPF reported.

for allocating 100 blocks each of has 80 bytes what i can do?

See the JCL manual. It will tell you everything you ever want to know!

duplicate concept
I just wonder why this topic is exactly the same as
jcl/topic4698.html

and we are wasting time answering both of them !