How fast is the "slow half" from a fusion drive?

Discussion in 'iMac' started by idutch, Nov 28, 2012.

  1. idutch, Nov 28, 2012
    Last edited: Nov 28, 2012

    macrumors newbie

    Nov 28, 2012
    Because the SSD option on a 27' mac is a ridiculous $1300 i'm considering a Fusion drive.
    I know a Fusion drive puts the stuff you use the most on the 128gb SSD part, But what if you need data from the other half? how fast is the other half?
    Is is at fast as a normal 7200-rpm hard drive? or maybe even slower?

    In that case i rather have a consistent speed.

    I'm also afraid if you use a lot of different files and the Fusion drive is always busy swapping data from the SSD part to the normal part the benefits of the Fusion drive quicky become disadvantages.
  2. macrumors 6502a

    Feb 28, 2012
    Difficult to say without knowing their caching algorithm. My guess is that accessing a file from the hard disk instead of the SSD would be regular hard disk speed. I suspect a file would have to be accessed a number of times before it was moved onto the SSD and that process would be at an idle moment in the background.

    Not sure why consistent access is more important to you than some fast, some not so fast.
  3. thread starter macrumors newbie

    Nov 28, 2012
    I mainly gonna use my mac for producing music, and i got a lot more then 128 gb of samples,presets ect. and always use dirfrent ones and i'm constantly searching thru and prelistening te files.
  4. macrumors 68040


    Aug 6, 2007
  5. macrumors 6502


    Sep 28, 2006
    what kind of machine did you have before when you were doing this?
  6. macrumors 6502a

    Nov 20, 2010
    Yep, Apple should have given us a 256gb or 512gb SSD option.
    If you use many big samples, get plenty of ram, that should help.
  7. thread starter macrumors newbie

    Nov 28, 2012
    I now have a late 2007 imac (duall 2.4 ghz , 4gb) that is realy showing its age.

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