Remark on padding

Full padding, partial padding, and no padding have certain consequences on the different computers, and should therefore be considered beforehand.

1. Full padding: all blocks on the output file have the same (user specified) length, which should be a multiple of 180 16-bit words. This mode will probably work on any computer for reading and writing.
2. Partial padding: ensures the blocks to have an integer length when counted in machine words (no trailing bits, or incomplete words on reading, no extra-bits when writing). This should normally work except on computers which can only read and write fixed length blocks.
3. No padding: since in the current package, full machine words are written on all computers, this may lead to problems when reading, on another machine but normally only if the physical or logical lengths are not known. For example, due to extra padding during the transfer, records of unknown length may not be processed correctly when received through a network.