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Thread: Dead HDD

  1. #1

    Member Since
    Aug 22, 2013
    Dead HDD
    I've been asked to repair a friends imac, my first mac repair, the hdd a WD caviar 250gb is dead, can I just buy another WD hdd or does it need to be mac specific? I see there are locating pins on one side of the drive can these be used in a new drive & how can the heat sensor be attached, any advice appreciated.

  2. #2

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Texas, where else?
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c should become one of your best friends for Mac teardowns.

    Never owned or tore down an iMac myself so can't help much.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac i5 2.7GHz, 16GB memory, OS 10.11
    If this is a 2009 or later iMac be aware that the heat sensors are extremely delicate and interfering with them will force the fans into jumbo jet mode permanently. Have a read of this first. iMacs are the very devil to crack and work on.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  4. #4

    Member Since
    Aug 22, 2013
    Thanks for that HarryB, I removed the hdd to put some power thro it and it ran, but was noisy, in my experience that's not good when I replaced it and booted the system the fan was ok, so I guess I got away with it. any idea about the type of drive, or the pins?

  5. #5

    Stretch's Avatar
    Member Since
    Jan 13, 2007
    Central New York
    15in i7 MacBook Pro, 8GB RAM, 120GB SSD, 500GB HD
    What year and model iMac is it? New iMacs what identical drives, older iMacs are OK with pretty much any drive.
    Blog and Photo Gallery:

    Currently running OS X 10.10

  6. #6

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Fort Worth, Texas
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    I believe the proprietary sensor cable was first used in the iMac 2010 models on up and not the 2009. I remember reading that with the older iMacs all that had to be done was attach the heat sensor to the new hard drive. No special cable or drive required. The later model iMacs do need special consideration.

  7. #7

    Member Since
    Aug 22, 2013
    Model No on foot is A1224
    Description is IMAC20"/2ghz/1gb/250gb/sd/ap/bt
    Serial no W8733HFCX85

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