I have a Lacie 2big Network, 2 x 1 TB in mirror. One of them failed 3 days ago. It produces a clicking sound, the Raid status shows endless "Synchronizing". If I buy a new HDD, same type, and replace in the failed slot, will the new empty drive synchronize with old functioning drive? Or do I have to reformat the whole unit after replacing 1 drive? I want to know if I am going to lose the data on the functioning drive in the process?
I'm assuming you're doing RAID 1, if you replace the drive with the exact model as as the other drive - it will rebuild the array and clone the data from the existing hard drive.