What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Book End

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Chapters
00:00 Question
01:09 Accepted answer (Score 82)
02:15 Answer 2 (Score 4)
02:39 Thank you

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Full question
https://superuser.com/questions/441817/w...

Accepted answer links:
[Western Digital support page]: http://wdc.custhelp.com/app/answers/deta...
[Reduced Power Spinup]: http://www.wdc.com/en/library/portable/2...
[Spread Spectrum Clocking]: http://wdc.custhelp.com/app/answers/deta...

Answer 2 links:
[PC USB Terminal adapter]: http://www.acelaboratory.com/pc3000.udma...

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Tags
#harddrive #ssd #sata

#avk47