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Question about reading music from an external HD

So I run Djing software, serato scratch live and my laptop did not come with enough HD space to fit all of my music (still need 320GB more). I'm looking for a new external HD now but I'm confused about what I will and won't need, keeping in mind wanting to get the cheapest best for what I need.

1. Will RPM's effect the way my music plays off of my software? (5400 vs 7200)
2. USB 2.0 (my lappy didn't come with a 3.0) or Firewire, will it make a difference?

the best answer would be a suggestion to what drive best suits these specific needs, also I do not know what the cache means at all. Sorry for my ignorance.
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More about question reading music external
  1. cache is a small amount of high speed memory (RAM) that stores recent or frequently accessed blocks of data. This won't make a difference for streaming large files though.

    What is the data rate your software needs?

    Firewire will be MUCH faster for HD usage than usb 2.0. I don't know that the RPM will make that much of a difference in this situation, but 7200 is better than 5400, I'd get it personally.
  2. Most of my music files play at 320 kbps

    Here is a link to what I am using if that helps:
    http://serato.com/scratchlive
    http://rane.com/scratch.html#gpm1_9

    Basically the software will be accessing the harddrive to view and play music files.

    Sorry if that didn't help much, I will be sticking to firewire though!
  3. Best answer
    320kbps shouldn't be any issue for almost any modern HD. Again, I'd pick FW over USB2 if given the choice.
  4. Perfect, thanks for the help!
  5. Best answer selected by ampLitude.
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