Cache Size for HDD, what does it mean?

Discussion in 'Mac Pro' started by MythicFrost, May 29, 2009.

  1. macrumors 68040

    MythicFrost

    Joined:
    Mar 11, 2009
    Location:
    Australia
    #1
    Hey, I'm wondering what Cache Size is (8, 16, 32MB) for a hard drive, what exactly does that do? higher the better?

    Kind Regards
     
  2. macrumors 6502

    Joined:
    Jul 2, 2008
    #2
    The larger the cache the better. Cache is MUCH faster than the hard drive.

    Data is read and written to and from cache (hopefully). Then sent to the HD or to RAM.

    The more cache means more data that can be accessed quickly. As in orders of magnitude faster.
     
  3. thread starter macrumors 68040

    MythicFrost

    Joined:
    Mar 11, 2009
    Location:
    Australia
    #3
    Ah I see, ok thanks.

    So I should only get 32MB cache hdd's

    Kind Regards
     
  4. Roy
    macrumors 6502

    Joined:
    Jul 6, 2006
    #4

    "They" say bigger is better, but is 32MB cache 4 times better than 8MB cache?
     
  5. macrumors G4

    Joined:
    May 6, 2008
    #5
    Unfortunately, No. If you plot out the performance of the same drive with different cache values, it's not linear. But larger values do help, and it can be simplified to "get the largest available for the capacity". :D

    Another way to look at it, is cache/GB. For example, WD's RE3 line. The 250 & 320GB variants have 16MB of cache, while the 1TB model has 32MB. And the smaller drives do run a little quicker. Other issues such as platter count are also factors, as the smaller drives are singles.

    WD's datasheets show this in the specs, as does independent testing. Personally, I take what I can get. :D :p
     

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