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Not Dead Yet: WD Releases New 6TB 2.5-Inch External Hard Drives - First Upgrade in Seven Years
(www.anandtech.com)
This is a most excellent place for technology news and articles.
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"