External HDD is readable via USB2, but not USB3


  1. Dirkmaster
    Posts : 2
    Windows 7 Home Premium 64bit
       New #1

    External HDD is readable via USB2, but not USB3


    I have a new Drive that was formatted while attached to an External USB2 dock. I successfully moved about 1.5G of data onto it. But when I put it into a USB3 enclosure, it shows as uninitialized. Taking it out of that enclosure and putting it back in the USB2 dock, it reads fine. I have tried two other drives in the USB3 enclosure, and it reads them fine.

    Any clue why the USB3 enclosure can't read a drive initialized under USB2?

    Dirkmaster
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  3. TVeblen
    Posts : 6,292
    Windows 7 64 Bit Home Premium SP1
       New #2

    No. The USB speed should have nothing to do with it.

    Most likely the problem lies in the enclosure(s) itself.
    You don't say how large the problem drive is compared to the other drives, but if it is larger than 2.2TB, and the USB2 enclosure is older, then the enclosure's driver may be using a software "fix" to read large drives, and that software is unrecognizable on the other enclosure.

    Could be something else related to the enclosure, but that is the common problem.
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  4. Dirkmaster
    Posts : 2
    Windows 7 Home Premium 64bit
    Thread Starter
       New #3

    Yeah, its a 3T drive, so that IS probably it. Which means I'll have to copy everything off it, move to the USB3 enclosure, and then reinitialize and copy everything back.

    <sigh>

    thanx for the info!
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  6. TVeblen
    Posts : 6,292
    Windows 7 64 Bit Home Premium SP1
       New #4

    All told, that is the easiest way.
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