LaCie 500GB external will not show up on mac desktop. Blue light on, whirrs as if working but no icon on desktop (not mounted)

When it eventually will, check the disk (all terms may vary, depending of your version of Windows) :
Right-click the icon of the disk, then click "properties".
In the "Properties" window, select the "Tools" tab, and click "Check now". Check both checkboxes, and run.
This should fix the access problems on your drive.

Here's two suggestions. (If your using Mac OS X 10.x)
Make sure external hard drives are to be shown by clicking "Finder" in the menu bar then "Preferences" and under the "Sidebar" section selecting "External Disks".
Also check that the hard drive is mounting by opening "Disk Utility" by first opening the "Applications" folder then the "Utilities" folder and double clicking "Disk Utility" and in the left sidebar checking to see if your external hard drive is listed as one of the mounted drives. Hope this helps, don't forget to comment/vote if this helped. Thank you.

1. A. Yes.
2. A No.
3. A. Replace the LaCie

Hello! Had the same problem - go onto the Lacie official website. Select whatever type of drive that it is you have, and simply go onto the software update page. I literally downloaded the desktop manager (I own the Sam Hecht Little Disk) and it appeared! Good luck

do one thing check the drive on some other system also

i'm not sure i can solve this problem--which started for me tonight as well with my lacie d2 quadra 500 gb--but i can share a possible explanation i've found online: apparently, they have lots of problems with their power supplies. see if the power adapter (the black brick) is making a hissing sound, or if there is a ticking sound coming from the drive itself. i have both these sounds. i am hoping all my data is safe and that my i.t dept. will be able to fix it with a new power supply on monday.

http://www.pricespider.com/products/454765/LaCie-D2-301110U.html
This link has product reviews and problems others have had with it. It may be worth checking out.
Let me know how it goes,
Thanks
yalmer

check wires connecting them together first, ok?

then, turn off the LaCie, connect to your MacPro, and then turn on the drive..

that should show as a mounted drive.

need printer drivers update?

you may need to get a new driver for that lacie from their website..

support downloads, model o/s

Hi, I have just checked the LACIE website, So Google LACIE, click the second result [Lacie's own site] you will get a page up with a choice box, select Australia/go click the desktop HDD. click the 500Gb usb, this will give you a page with a support and a download link. click download, here you will find a manual and drivers. Goodluck mistyman