I'm no Windows guru but similar things happen on Mac OS X systems.

- Back up that disk to another volume.
- run a file system and hardware check. I don't know what sw is
available on Win to do this, but you should be able to find utilities
inexpensively or free.
- if the drive checks out, it might be a sign of a failing controller
or enclosure interface. Swapping the drive to another known-good
enclosure would demonstrate if the enclosure was failing. Use a known
good cable of course...

At three and a half years old, it's a little young yet to be close to
failure by the averages, but why take chances? A two terabyte drive
AND quality enclosure is barely two hundred dollars these days. I'd
add a new one to the system, clone the data over, then erase and
continue using the old one as a temp or work drive, keeping it backed
up, until it fails. With a suitably comprehensive backup system, the
risk of data loss is small.

On Tuesday, July 5, 2011, Brian Walters <[email protected]> wrote:
> G'day all
>
> For several months one of my external hard drives has been acting a bit
> 'flaky'.
>
> The drive is permanently attached to the PC but when the computer boots
> there is no sign of the drive in Windows Explorer.  However, after about
> 10-15 minutes, the autoplay window magically appears and the operating
> system reads the drive, which then becomes available.  The drive
> continues to work properly thereafter - until the next boot when the
> process starts over again.
>
> My question is whether the hard disk itself is on the way to hard disk
> hell or whether the drive controller is likely to be the culprit.  Or
> could it be a faulty USB cable? Would it be worth extracting the drive
> from its case and try installing it in a new case? The drive is about
> three and a half years old.
>
> Note that I'm not relying on this drive as a primary back up any more,
> but it is convenient if it keeps working.  And I'm just curious as to
> why the drive would be behaving like this.
>
>
>
> Cheers
>
> Brian
>
> ++++++++++++++++++++++++++++++++++
> Brian Walters
> Western Sydney Australia
> http://lyons-ryan.org/southernlight/
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  godfreydigiorgi.posterous.com

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