I say like it..... not the A sound, not dAAta, but daaata. It's not aw but aaaa aaa-uh.
Now I'm saying it dAta though, with the letter A sound.... Dernit..... If I'm not thinking about it, I'd saying daata. How do you represent aa-uh? Not A. Not aw. But aa-uh. I guess I'll go with aa.
So I say daata when I'm thinking about it. When I am thinking about it, I say dAta with the letter A sound.
That's a good question.
I did use to teach linguistics to undergraduates for a few years, and I would be reamed out if I didn't do this right in front of students.
Unfortunately, I've forgotten all the IPA and I've never had any training as a linguist, just tools of the trade and practical coursework, at an elementary level, obviously.
That's /eɪ/ plus a little schwa or the caret symbol (I don't remember what the difference is between the ə and the ⋀ is, except they sound the same to me in the upper right after the diphthong. The caret is supposed to be some kind unstresses something with the tongue in medial position, and I think the schwa is a little bit more back and higher, but also, obviously, unstressed.
i really don't remember at all how to transcribe in IPA, but it is a neat tool when used properly. It's IMHO not so much a supernumery language, but just a tool to demonstrate using a chalkboard, or these days a whiteboard.
Did I mention I hate linguistics yet? Those people are off their nut, more or less. Don't believe me? Go to a local university or college and try talking to a professional linguist. They are not that good, IMHO.
BUT, a good measure of professional linguists I've known have some pretty deft skills at mimicry. You know, doing accents and such. "Hey! Linguistic! Hit me with a Strasbourg accent!" They can be pretty good at that.
Well, at least I remember how to spell "diphthong," so, got that going for me.
/*Sorry if the IPA symbols don't show up correctly. They looked OK ab initio but I think they'res a bad moon rising with ither my browser or whatever rendering engine.*/