Macbook Pro HD Upgrade

Discussion in 'MacBook Pro' started by AZ-GT, Nov 2, 2006.

  1. AZ-GT macrumors member

    Mar 24, 2005
    I want to upgrade the HD in my 15" Macbook Pro. There is a Toshiba 200 gb
    at 4200 RPM or a Seagate 160 gb at 5400 RPM. Should I go for speed or storage? (Price doesn't matter) :rolleyes:
  2. WildCowboy Administrator/Editor


    Staff Member

    Jan 20, 2005
    Which is more important to you?

    I think the 200 GB drive is pretty slow...
  3. TowerRat macrumors newbie


    Oct 16, 2006
    Washington State USA
    I vote SPEED
  4. treblah macrumors 65816


    Oct 28, 2003
    Maybe not…

  5. AZ-GT thread starter macrumors member

    Mar 24, 2005
    I'm leaning toward the 200gb because of the storage. I have 60gb in my Itunes library, want to make room for Parallels, and haven't even started collecting video clips. My MB Pro will be my only computer.
  6. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    However dense the data is on the platter, there is still the latency problem. Latency is the time it takes before a drive is ready to start reading or writing actual bits. For small data reads and writes, the latency takes more time than the actual read or write.

    For any read or write, the platter has to rotate under the head to locate the start of the data block. This takes an average of half of the rotational period of the drive (under ideal conditions. Head transit time and logical processing time may make it take more than one rotation by the time the head is ready to read - but the relative measure is still applicable)

    4200 RPM drive rotational latency average is .12 microseconds

    5400 RPM drive rotational latency average is .09 microseconds

    That's a 25% reduction in latency; this affects almost every operation that the drive does. The exception is streaming a large block of contiguous data, uninterrupted by other requests, in that case latency is minimized.

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