You have connected you Lacie external drive on your Mac computer or laptop but the lacie rugged mini won't mount and you are not able to access any of the data that was stored. The external drive is often connected to other systems which can easily cause the corruption and it can be the reason why you are facing the problem. However you must try to reconnect the drive again and check if the problem still persist then you can use the disk utility in the Mac system to resolve the lacie rugged mini won't mount issue. If it fails then you need to format the drive to remove the corruption. You should also know that while doing this all your data will get deleted. But you don't have to panic as the data can be recovered after the lacie rugged mini won't mount problem is resolved. You can use any of the available backup or you can use the Lacie drive recovery software on your Mac to scan the Lacie drive and then you are provided by the list of files that can be recovered on selecting. So you should download the software now and use it.