(i) Simple to implement
(ii) Requires very low software support
(iii) Efficiency of blocking is good
(iv) Blocking results in saving in terms of input-output time required handling a file.
(v) A substantial amount of storage space on the disk can be saved.

 

 

(i) Updates are not easily accommodated
(ii) Random access is not possible
(iii) All records must be structurally identical, if a new field has to be added, and then every record must be rewritten to provide space for the new field.
(iv) Continuous areas may not be possible because both the primary data file and the transaction file must be looked during merging.