Question about Iomega 33089 250 GB Hard Drive

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Will not back up - says 'Invalid drive specification'

I have an Iomega external hard drive. P/N is 31641400. model is MDHD320-U. Used to back up for 3 computers. Suddenly ceased working for one of the computers - message 'Invalid drive specification' shows. Nothing has changed, and the other two computers back up OK.

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  • bruce_943 Feb 08, 2009

    Thanks for your response. The drive letter is still the same. In fact, I had a good look at what had been going on on the offending computer over the past 3 weeks, which was when the problem started. I found that a Java update had been installed. I therefore carried out a system restore to just before the installation of the update and, hey presto, the problem disappeared. Clearly, there is something in the Java update that interferes with either the notepad instructions or does not allow the Iomega drive to recognize the driver.



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  • 73 Answers

Did you add another drive to that computer? it sounds like the hard drive has taken on a different drive letter and you have a program that has the drive letter specified. check to make sure the drives letter didnt change.

Posted on Feb 07, 2009

  • Matt Barr Feb 08, 2009

    Im glad you were able to figure that out



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My external hdd used to be reconized and accessable by my computer but after several uses all it does is make a buzzing sound. My computer will not reconize its presence until after it is shut down.


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Please do accept this solution and revert for further assistance.


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I have an Iomega external hard drive. P/N is 31641400. model is MDHD320-U. I have been unable to locate any DC12V adapter to work on my external hard drive. Could you please assist me in finding one that...

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NUMBER +0-9-3-2-1-1-0-1-7-1-7

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