How do you pronounce the word "data"? Is it "d-E-i-t-e" or "d-A-t-e" ?
the small "e" stands for "schwa", just interested in the first vowel

Question

Answer

Both are common.

https://www.oxfordlearnersdictionaries.com/definition/english/data?q=data
 data noun
BrE /ˈdeɪtə/ ; NAmE /ˈdeɪtə/ ; BrE also /ˈdɑːtə/ ; NAmE also /ˈdætə/ 
(used as a plural noun in technical English, when the singular is datum)

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That depends on where you are in the world. Americans say 'datyta'. I would imagine that most of the resto of the world says 'dahta'.

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Personally I usually pronounce the first syllable to rhyme with the English word "day", but sometimes I use the other pronunciation, the vowel which rhymes with "cat". They both sound natural to me, but I don't know whether that's true everywhere (I'm in the US)

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