LaCie drive not recognized error is quite a frustrating situation you face when you connect your LaCie drive to Mac for transferring data. Lacie drive is a good option for expanding the storage space of your Mac system. But sometimes the problem occurs and you get Lacie drive not recognized error, There can some connection issue so you must first check the connection. If you are still getting the error message then you can the LaCie drive has been corrupted or the Mac system does not support the file system present in the drive. In either of the cases you have to format the drive. But before formatting you check the drive by connecting it to another system. IF you encounter the same problem there then there is no other option than formatting. You can format the LaCie drive by using the disk utility present on the Mac. After the formatting to the HFS + partition you will not get the LaCie drive not recognized error. To get back the lost data you can use the LaCie drive recovery software. It scans the drive with powerful algorithm and is capable to recover almost every type of data. Just get rid of LaCie drive not recognized error and then use this software to restore data.