<storage, communications> An extra byte (or word) appended
to a block of data in order to reveal corruption of the data.
Bit n of this byte indicates whether there was an even or odd
number of "1" bits in bit position n of the bytes in the
block. The parity byte is computed by XORing the data bytes
in the block. Longitudinal parity allows single bit errors to
be detected.
<storage, communications> (LRC, Block Redundancy Check) An
error checking method that generates a longitudinal parity
byte from a specified string or block of bytes on a
longitudinal track.
The longitudinal parity byte is created by placing individual
bytes of a string in a two-dimensional array and performing
a Vertical Redundancy Check vertically and horizontally on
the array, creating an extra byte. This is an improvement
over the VRC because it will catch two errors in the
individual characters of the string, beyond the odd errors.
