There are 2 ways people pronounce the word "data."
1st pronunciation of data: pronounce the first syllable of "data" as you would the word "day." To form the second syllable, start by pronouncing the t like the t in the word "tack." Pronounce the last a of the word "data" as you would the "a" in the word "blah." Combine the t and a sounds to get the second