Joined: 05 May 2005 Posts: 98 Location: Navi Mumbai, India
F - All blocks and all logical records are fixed in size.
V - Blocks as well as logical records are of variable size. The first 4 bytes of each block (and logical record) describes its length.
B ? One or more logical records reside in each block. B cannot be coded alone. It is used in conjunction with F or V. For example FB or VB.
Hope this answers your query.