[Gargoyle_Steve (Steve)]

Do you know why that particular sentence, ie " The quick brown fox jumps over the lazy dog " was used as a test sequence for various data, teletype, etc, devices?

It is the shortest sentence in the English language (35 letters total) that contains all 26 letters in the alphabet at least once!
(alternately .... The quick brown dog jumps over the lazy fox!)

In a similar vein when testing or doing a secure wipe of a hard drive a repeating sequence of "A5A5A5A5 ... " is written, followed by the opposite sequence, "5A5A5A5A..."

Each sequence, converted to pure binary, is a continous stream of alternating 0's and 1's, but the "negative" of the other ie 10101010.. & 01010101...so that by writing both sequences in turn acros an entire drive every singe storage bit available on the drive has been written as both a 0 and a 1, again the most effective means of testing every possible combination..