HD Speed - 1TB in 24 iMac

Discussion in 'iMac' started by hukuma, Aug 15, 2008.

  1. hukuma macrumors newbie

    Jul 15, 2007
    San Diego, CA
    Does anyone know if there's a difference between the drive speed of the 320GB and the 1TB drives in the iMac? I'm leaning towards the larger on-board drive...given that I have several TB of lossless music, video, etc. Obviously, I'll still need to run from some external drives, but I'd like to keep as much music as possible on-board.
  2. Cave Man macrumors 604

    Cave Man

    Probably won't matter since the iMac still has a lame-@$$ 1.5 gbps SATA controller.
  3. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Sep 20, 2007
    Gondwanaland Reunification Front HQ
    - All ALU iMacs have 3 Gbit/sec internal SATA interfaces.

    - Even the 1.5 Gbit/sec SATA in older iMacs is faster than the
    fastest/most modern high-capacity drives (i.e., 500 GB and up),
    and much faster than any USB or firewire external drive.

    To the OP: internal drive speed is a crap-shoot. There's no telling
    which make/model you'll get with a new iMac. It's a safe bet that
    it'll be something reasonably fast (in the 80 MByte/sec ballpark),
    but probably not the latest super-fast (> 100 Mbyte/sec) models.

    Also be aware that a modern drive's "maximum R/W transfer rate"
    applies only to the outer tracks. The speed drops by about 50% for
    the inner tracks -- so, any given drive is about twice as fast when
    nearly empty as when nearly full.

  4. hukuma thread starter macrumors newbie

    Jul 15, 2007
    San Diego, CA
    Thank you

    OK...thank you for the information. Looks like there isn't a downside to taking on the 1TB drive!
  5. Phil A. Moderator

    Phil A.

    Staff Member

    Apr 2, 2006
    Shropshire, UK
    Where did you get that information? According to System Profiler, my 24" iMac has the following in it

    To answer the OP's question, I have the 1TB drive in and it seems plenty fast - it's a Hitachi HDS721010KLA330, which is a 7,200RPM drive with 32MB cache, 8.5ms seek time and has a 300MB/S (3.0 Gigabit) interface
  6. Cave Man macrumors 604

    Cave Man

    Well, there you go. I thought the iMacs all still had ICH7 controllers... :eek:

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