(名詞/形容詞) 數量極大但確切數量不詳的資料 (的)。這個字是由 helluva (lot of) + byte(s) 拼綴而成。

Storage capacity continues to grow, necessitating new labels for ever larger quantities of data. Beyond an exabyte (1018 bytes), we have the zettabyte (1021 bytes) and yottabyte (1024 bytes), which follow the prefixes offered by the International System of Units (SI). In response both to the rapid growth of data and the proliferation of terms, some have suggested that we simply use “hellabyte,“ for “hell of a lot of bytes.”
—Joe Arnold, OpenStack Swift, O’Reilly Media, October 16, 2014

“We need a new way to think about analytics. Analytics needs to be about fast, smart decisions”, said Tom Davenport. Yet, he said there is a problem with big data? What is next if we continue to call it big data — hellabyte, muchabyte, and lots of byte?
—Myles Suer, “Pearls of Wisdom for Digital Disruptors,” Informatica, May 21, 2015