Parity is still used.http://en.wikipedia.org/wiki/RAID_5#RAID_5http://en.wikipedia.org/wiki/RAM_parity
Mr. Cray was famously known to have said "Parity is for farmers", but later changed his mind saying "Farmers buy computers", or something like that.
I don't know if parity is used by TBC, but would tend to doubt it since most errors are due to physical deterioration or other physical errors.
Thanks for the information Moji,
To expand slightly on the historical note, the technique for error correction by IBM - usually in the early tape drives (Model 2400 etc.) was the CRC. (or Cyclic Redundancy Check) http://en.wikipedia.org/wiki/Cyclic_redundancy_check
You can read about the type of storage protection currently in use here:http://en.wikipedia.org/wiki/Storage_protection
in which (varying sized) protected blocks of storage may be implemented in the hardware or the software of the using system.
Now the question, does TBC use protection or parity or error correction?
I don't "think" so. We will probably learn more when we figure out how holographic memory storage works. I suspect it has more to do with filtering out the "noise" inherent in any data transmission.
If we consider data errors as noise, that is.
And while we are discussing error correction, remember the tech reps favorite mantra? Always back up your files!
Does TBC have a back up?