Terabyte: a “monstrous” amount of data

Last week, the Panama Papers leaked 2.6 terabytes of data. That adds ups to 11.5 million confidential documents about the secret, and potentially scandalous, offshoring of wealth across the globe. That’s a lot of information. You might even call it a “monstrous” amount, if you look to the origin of the prefix tera

Monsters and marvels 

While the Oxford English Dictionary (OED) first attests terabyte in 1982, the International Union of Pure and Applied Chemistry (IUPAC) officially adopted the scientific prefix tera-, or tira- in its original French, in 1947. As the OED cites: “The following prefixes to abbreviations for the names of units should be used to indicate the specified multiples or sub-multiples of these units: T tira- 1012 ×.” One of the earliest usages, as far as I can tell, is teracycle, in reference to some very fast frequencies.

The IUPAC also gave the temporary names to some newly discovered elements, including ununtrium and ununpentium, as I discussed earlier this year.

To acknowledge the sheer size of this prefix quantifies, IUPAC scientists looked to a Greek word: τέρας, or teras. According to Liddell and Scott’s Greek dictionary,  the ancient Greek teras had two main meanings: 1) a “sign,” “wonder,” or “marvel,” as of the heavens; and 2) a “monster,” like a  giant serpent of the sea. The connecting sense appears to be “awe-inspiring size.”

The Modern Greek edition of Disney’s The Beauty and the Beast translates “beast” with our focal Greek word,  teras. Image from greekshops.com.

We see a similar sense development in a prodigy, which, as in its original Latin prodigium, named both a “portent” and a “monster.” Perhaps we can imagine the ancients – and ourselves – trying to make meaning out out of some sublime but terrifying storm or creature, as Edmund Burke philosophized.

Tera-ble words 

English, as did Ancient Greek, used tera- (or its genitive τερατ-, terat-) as a combining form to make new words. Apparently a nonce usage, English scholar John Spencer used teratoscopy, or “augury from prodigies,” in his 1665 Discourses Concerning Prodigies, as the OED records. We see a teratology, a “tale about something marvelous,” in Edwards Phillips’s 1678 New World of Words, an early English dictionary. By the 1720s, something teratical “resembled a monster.”

By 1842, biologists applied teratology to the “study of physiological abnormalities,” which reminds us that we once referred to such conditions as “monstrosities.” Terata, teratogen, teratoma, and teratogenesis developed as other scientific terms referring to various physiological abnormalities.

For Indo-European scholars, the Greek teras has its lexical lair in the Proto-Indo-European *kwer-, “to make.” The American Heritage Dictionary of Indo-European Roots (AHD) cites cognates in the Sanskrit karma (literally “something made,” hence an “act”) as well as the very word Sanskrit (“well-formed”). Barnhart’s etymological dictionary, among others, cites Balto-Slavic relatives meaning “sorcery” and “spell.”

What is the sense development from “make” to “monster”? As the AHD suggests, a monster can “make” harm – or cause destruction.

Super-sized storage

Terabytes aren’t the only “monsters” terrorizing computer technology. The giga- in gigabyte is also borrowed from the Greek. Here, γίγας, or gigas, originally one of the superhuman “giants” the Olympian gods overthrew. English ultimately gets its word giant from this Greek root. Like terabyte, giga- was adopted by the IUPAC in 1947, this prefix signifying 109, an order of magnitude of one billion.

According to some accounts,  computer scientist Werner Buchholz coined byte in 1956. A byte contains 8 bits of digital information; bit is shortened from binary digit. Byte apparently, nods to this bit and plays with bite  (appropriately enough for this discussion of monsters). Megabyte appears by 1965, kilobyte by 1970, if the OED is any measure.

Clearly, as computer memory increased, so did the need for ever-larger prefixes, hence the super-sized gigabyte and terabyte of the 1980s. (And up from a terabyte is a petabyte, but I’m not going to take that bait.)

A terabyte is indeed a “monstrous” amount of data. But the real monsters, many fear, are lurking in the shadowy, financial underworld of the offshore accounts, shell companies, and tax havens the Panama Papers may just bring to light.

m ∫ r ∫


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