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If your computer or laptop has a problem detecting a USBhard drive or a USB device, and another computer can detect it, then theproblem could be a RF interference problem.
Try using an USB cable that is a shielded USB cable (ie. AnUSB cable that has a clear plastic covering and you can see a metallic weavewhich covers the wires) OR a USB cable that has a Ferrite core attached to theUSB cable (the ferrite core is a cylindrical object approximately 30mm long X15mm diameter and it is attached to the USB cable near the connector).
Since you have tried connecting the hard drive (HD) into two computers
(Win7 and Vista) and both of them had the same problem, you may want to
try replacing the cable of the HD.
Another thing, try connecting the HD into a Windows XP computer and see
if same thing will happen. If you're hearing a clicking sound while the
HD is turned ON, I'm sorry to say but the HD is no longer working. That
clicking sound is also called the "Click of Death".
Your external drive has 2 parts, the hard drive, which is just a normal hard drive you would find in any computer, and the usb bridge, which connects the hard drive interface (either ide or usb) to the usb or firewire or esata or whatever. Sounds like one of these are bad. Does the computer see the bridge? it should show up as a mass storage device in device manager and the safely remove usb devices dialog. If not, then get a new enclosure for the drive. These range from 25-100 dollars. If the bridge does show up, take apart the enclosure and pull the drive out and try hooking it up as a second drive in your computer. If it works there, then you need a new enclosure. If not, then you need a new drive.
Some PC's cannot deliver enough power to the USB devices to function properly through the USB port.
Does your Lacie hard disk have a power input connector if so conect a power adapter to it before you put it into your USB port.
Another alternative, get a powered USB hub connect it into your computer then connect the Lacie hard drive to the powered USB hub.
First I had to reseat one of the drives which had worked loose and become unseated during shipping. Then I had to format the hard drive and finally I had a 1TB external hard drive I could use. The light is still red.