I have a 1TB Lacie external drive that does not mount on my iMac. It did until today. The drive powers up but does not mount. I ran Disc Utility but this drive does not appear in the left hand column. I repaired permissions but still no Lacie drive. I also used different means of connection -- 400 firewire, 800 firewire and USB. It still would not mount. Could it be the power cable?? If the drive needs to be repaired how do I recover the data on it and get it repaired?? Thanks!

SOURCE: No firewire 800 or 400 functions in Leopard for SIIG FireWire 800 + Hi-Speed USB Combo PCI Adapter

Unistall and reinstall through control panel. use the drivers it came with. Make sure the drivers are for ur OS. If not, check with manufacturer for proper drivers.

Posted on Mar 15, 2008

SOURCE: I have a 1TB LaCie

First try in another Mac System if possible. If it works then its a problem its a problem with your FW800 port or the OS/drivers.

try uninstalling and reinstalling the drivers and also update the firmaware.

Link which will be of help ;

http://discussions.apple.com/thread.jspa?messageID=5780373

Thanks.

Posted on Oct 24, 2008

SOURCE: I have a 1TB LaCie

1. Make sure to copy any files on your hard disk to another location because reformatting will erase them.
2. Click on your computer hard disk’s icon. Select Applications ? Utilities ? Disk Utility.
3. In the left hand column, click on the drive icon for the LaCie Disk (or the name of your external drive). Make sure you click on the first icon, not the second level volume icon.
4. Select the Partition tab.
5. Select the format type from the Format drop-down menu.
* Select Mac OS Extended (Journaled) (recommended) or Mac OS Extended.
6. Click on the Options button.
7. Select the type of partition you want to use:
* GUID Partition Table - for bootability on Intel-based Macs
* Apple Partition Map - for bootability on PowerPC-based Macs
8. Click OK.
9. Click the Partition button.

more using this
http://www.lacie.com/download/qig/bigdiskextremeplus_esata.pdf

Posted on Oct 24, 2008