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Hitachi external HDD losing connection

632 Views 7 Replies Latest reply: May 23, 2013 3:55 AM by LexSchellings RSS
DPHolland Calculating status...
Currently Being Moderated
Mar 18, 2013 1:16 AM

Hi,

I have a problem with a Macbook running 10.6.8 and a Hitachi external HDD. The HDD has its own power supply. It is partitoned into 2 1TB partitions, one for Time machine and one for data.

It works as it should for a day or so then the Macbook seems to lose the connection to the drive. I have tried both USB ports on the Macbook with same result.

HDD works fine on a 2009 iMac running 10.8.2 !! The Macbook is running from mains power too, not battery.

Any ideas?

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Mar 18, 2013 6:50 AM (in response to DPHolland)

    The obvious first.....have you tried a different USB cable?

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Mar 18, 2013 3:44 PM (in response to DPHolland)

    You might try resetting the SMC and pram

    Laptops with a battery you can remove 

    Shut down the computer.

    Disconnect the MagSafe power adapter from the computer, if it's connected.

    Remove the battery.

    Press and hold the power button for 5 seconds.

    Release the power button.

    Reconnect the battery and MagSafe power adapter.

    Press the power button to turn on the computer.

     

    Resetting NVRAM / PRAM

    Shut down your Mac.

    Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.

    Turn on the computer.

    Press and hold the Command-Option-P-R keys before the gray screen appears.

    Hold the keys down until the computer restarts and you hear the startup sound for the second time.

    Release the keys.

  • LexSchellings Level 5 Level 5 (5,485 points)
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    May 22, 2013 8:26 AM (in response to DPHolland)

    What does Disk Utility say? Which format has the disk.

    There is an app that has very interesting testing protocols (you may have to install an extra smart driver for an external disk) in Appstore: DriveDx. You can also downoad a trial of that app: http://binaryfruit.com/drivedx.

    It does much more than just check the Smart Status.

  • LexSchellings Level 5 Level 5 (5,485 points)
    Currently Being Moderated
    May 23, 2013 3:55 AM (in response to DPHolland)

    In SystemInformation, check the Diagnostics, and the USB in the hardware section, if nothing special, use the Apple Hardware Test.

    BTW: did you format both partitions the same or different?

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