Lacie usb hard drive not recognized is a big problem because you may have saved many important files in the external drive that are now inaccessible. The Lacie is very helpful for the Mac user as the it has limited storage and data can be transferred easily. But in some cases the Lacie drive is not mounted properly and then you should be worried about your data. The can happen when the Lacie drive is not connected well, it is not getting enough power, the drive has been corrupted, the file system is damaged or it has been corrupted. The lacie usb hard drive not recognized can be solved when the drive is reconnected and then scan it with the disk utility for any corruption, The disk utility can find the cause of corruption can fix it . If the issue is not fixed you the drive has to be formatted and the data will be deleted. You can get the files back if you can manage any backup of the lost files. If the backup is not updated or available then you can use the Mac data recovery software which can scan for the deleted data and restore it. You can download the software and resolve lacie usb hard drive not recognized.