DISP=OLD --> Exclusive HOLD. Read from beginning of dataset. But if u write, then it will overwrite on existing data. i.e old data is lost.

DISP=MOD --> Exclusive HOLD. You can write to the end of the file without loosing your old data (i.e append the data to the existing file).

DISP=SHR --> multiple user can share the data. Its read-only file.

With Regards to COBOL:

DISP=SHR and OPEN EXTEND in-file => will append the file at the end. Used mainly for line-sequntial file (i.e notepad with extension .TXT or .DAT)

DISP=MOD and OPEN I-O => will also append the file at the end. (not used for line sequantial file)

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