From the article:
UPDATE 5/17, 6 PM: Western Digital has confirmed that the new 2.5-inch T GB HDDs uses 6 SMR platters
SMR = shingled magnetic recording https://en.m.wikipedia.org/wiki/Shingled_magnetic_recording - "continuous writing of large amount of data is noticeably slower than with CMR drives"
Yep, same here. Whereas ChatGPT and Perplexity would tell me it didn't know the answer to my question, Bard/Gemini would confidently hallucinate some bullshit.