3.5" external HDD vs 2.5" external HDD

By monrayl
Oct 16, 2011
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  1. Hi, I am considering purchasing an external hdd, but I would just like to know whether it would be better to buy a 3.5" or a 2.5". Are there really any major differences between the two?
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,684   +153

    "Are there really any major differences between the two?"...
    In a word, No
  3. Exonimus

    Exonimus Newcomer, in training Posts: 137

    There are, in fact, differences.

    2.5' usually have a lower power consumption, since they do not have an external power supply. You just plug them into a USB slot and go. The 3.5' do have external power supplies, and usually consume more power. That being said, this varies per model, of course.

    Furthermore, since the 2.5' external hdd's are usually based on laptop models (that's why they require less power) they are usually also slower, rotation speed wise. Then there's the obvious difference of size.

    Finally, the price is usually different. One pays more for a 2.5' hdd with the same storage space as a similar 3.5' hdd. The real question is therefore: what are you looking for in a harddrive, and how much are you willing to pay for it? :p
  4. monrayl

    monrayl TechSpot Member Topic Starter Posts: 74

    Thanks guys, I appreciate your input :).


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