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HDDs are slow, bulky, and noisy, however SSDs are Quiet, really fast, and slim.
HDD should be mainly used for mass storage, not your OS, more capacity is not always better, my current setup is 120gb ssd and 1tb HDD Storage.
I have purchased many SSDs and I have never had one fail on me, as opoposed I have had many seagate HDDs get noisy over time and even fail.
If you must use a HDD at least get a WD Black.