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Internal drive size limit - Mac Applications & Software

I have an iMac G3, and I want to put a larger hard drive in it. I looked at a 160 GB drive, and it said something about "48-bit addressing" (good) vs. "28-bit addressing" (bad). How can I tell which applies to my computer? I understand that some computers can only read the first 137 GBs on some hard drives. The System Profiler doesn't seem to have anything to say about it....

  1. #1

    Default Internal drive size limit

    I have an iMac G3, and I want to put a larger hard drive in it. I looked at a
    160 GB drive, and it said something about "48-bit addressing" (good) vs.
    "28-bit addressing" (bad). How can I tell which applies to my computer? I
    understand that some computers can only read the first 137 GBs on some hard
    drives. The System Profiler doesn't seem to have anything to say about it.
    Del Guest

  2. #2

    Default Re: Internal drive size limit

    In article <aol.com>,
    comBITEME (Del March) wrote:
     

    It's not good vs. bad so much as new vs. old. And your machine won't see
    the full 160G. If your iMac has FIreWire, it might still be worth
    getting a large drive and putting it into a FireWire case, making it
    easy to take with you as you upgrade machines or if you go to someone
    else's house. Just make sure the bridge board in the case is up-to-date.

    G
    Gregory Guest

  3. #3

    Default Re: Internal drive size limit

    comBITEME (Del March) writes: 

    See here:

    http://www.xlr8yourmac.com/IDE/big_ide_drive_support.html

    In order to use a large drive, you need MacOS 10.2 or later and a
    compatible boot ROM.

    According to Apple:
    http://docs.info.apple.com/article.html?artnum=86178

    only the XServe and mirror-drive-door models have a compatible boot
    ROM. But according to the xlr8yourmac.com article (cited above),
    people have reported success with iMac/G4 and QuickSilver-2002 models
    as well.

    I doubt your iMac/G3 will have a compatible boot ROM. Which means
    you have two choices.

    You can install the drive internally and be limited to the first 128G
    (which is 137G in decimal, the way hard drive makers advertise it) or
    you can buy an external FireWire drive.

    (You could also buy an internal drive and put it in a FireWire case
    on your own. Just make sure the IDE-FireWire bridge supports 48-bit
    addressing or you won't gain anything.)

    -- David
    David Guest

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