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The power supply is green until connected to the Lacie HD when it flashes, and the HD does not mount.

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  • philip_cowan Jul 27, 2009

    Yes, I'm beginning to suspect that the power socket on the HD isn't working, or is somehow faulty.

  • Laurence Reeves
    Laurence Reeves May 11, 2010

    Are you on a macintosh?

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  • Master
  • 3,153 Answers

I devised these simple steps that tend to remedy quite a few issues with most portable / external hard drives (though not always)
A few things to check but assumes USB and Windows for other interfaces / operating systems similar steps may be adapted to suit.

1. Ensure it is connected directly to the computer to a USB 2.0 port not a USB 1.0 port as this can have effects on performance and reliability
2. Use only the cables that came with it NOT one that fits that may have been lying around or is longer. Not all USB cables are equal even though they should be)
3. Do not connect through an external USB HUB unless that hub is USB 2.0 AND has its own power supply.
4. Use ONLY the power supply that came with it if it has an external power supply
Don’t use any other unless you know it has both the same voltage and current rating e.g. 12V 500mA anything rated below that would not work properly.
5. Always use the same port for connecting your devices. Some devices do not like being switched about. If switched they may want to install software / drivers again.
If you checked and fixed anything there and still have issues carry on reading.
Go to your control panel and then administrative tools, select Computer Management.
Now select Disk Management and expand the window.
Your drive should be listed here, if not then you need to check your computer hardware has not got any issues before proceeding.
If your drive is listed and says healthy then right click on it an select Properties, click Tools and then Error Checking, Check now, tick the two boxes and then Start.
This will attempt to fix most minor / common errors on the drive. It may also ask you to restart which is fine. Allow it to finish its work or you could corrupt the drive. If all went well you should be able to use it normally again.
If you drive was listed but did NOT say healthy then right click and select Format. Choose NTFS as the file system and do not tick any boxes you do NOT want quick format. Again start and let it do its thing. When it is done restart your computer and you should be good to go.
If you still have problems with the drive you might want to look at other areas.

Posted on Aug 23, 2009

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I connect my Lacie d2 quadra to my mac with firewire 800 and it works fine, but when I connect the same hard disk with esata, it appears on the desktop screen, but the blue light won´t stop...


Hello.
I have had simular problems with one of these. It can be due to the drive not starting up or shutting down properly or a powers issue.
I woud recomend dissconecting all leads from the back of the hard drive.
Now plug in just the mains power. Now turn the drive on and let it boot up until the light stops flashing. Let it stay constant for a while, now press the power/led button to let it shut down properly on it's own.
Now turn of your mac. with the hard drive still OFF, connect the fire wire to you're mac and HD. Now power up the Mac. If the HD does not power up on it's own, turn it on now.
Hopefully all should be ok now.
If not, try to test it on a PC. It may sound strange, but it can make a difference. Now do all the above again.
Any Luck?
Ok another thing is to try a psu. Hopefully you know someone with a drive you can ask to test their power supply with.. Try all of the above things again? Any joy? if it all workd ok with their power supply and not your's, your mains transformer is bust. It's caused by a capcitor that blows (quite common). If your drive is recent, you may be able to harrass Lacie for a new one, if not I managed to get a Lacie psu from ebay for around £25.00+p&p on ebay.
A final thing to check is what firewire version your mac is against the firwire version of the lacie. Sometimes this can give issues.
Hope this helps.

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My Mac suddenly cannot find my Lacie external storage device. I have turned off, unplugged, restarted... etc. and it is still not finding it. The Lacie seems to be on, at least the blue light is...


A continuous flashing light on a Lacie drive is a notification of a problem. I do wonder if the light is flashing the same if the drive is plugged in to the Mac or unplugged.

Lacie external drives tend to have power-supplies which become weak/bad. Most users replace the supply and it will work again for awhile until the supply dies again. Try bringing the drive to a retail dealer with Lacie drives -ask them if you can just test your drive with another power-supply (if you do not have another). You can also try calling Lacie, it's always slightly possible they will be aware of this problem.

Alternately, IF the light is only flashing when the drive is plugged-in to the computer, try using a different USB or Firewire cable.


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If you are in a tight spot use the temporary power supply to move your data to another drive and get the correct 57w power supply before running the drive again.

Don't do as I did assume any Lacie power supply will run any Lacie hard drive, they won't, fortunately I had a second back up, but am 2 drives down and no new PSU's available to buy anywhere.

Try and purchase another spare 57w power supply, something all D2 users should do for long term security, as these do not seem to be very reliable and getting warranty support from Lacie on these is currently impossible.

The lack of 57w power supplies from Lacie and its distributors across the world is surely a warning to be noted!!!!!!

Buyers beware!

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