niceflower

Thanks trurl for the fast reply! I will proceed like that.

Hello, I apologize for posting a similar question in other topic, but as this is my first time performing this procedure, I would appreciate confirmation before proceeding. Currently, I have a small system with four SATA ports configured as follows: SATA 1: 4TB Parity SATA 2: 4TB Data SATA 3: 4TB Data SATA 4: Free I have purchased two used Exos 18TB drives and would like to achieve the following configuration: SATA 1: 18TB Data SATA 2: 4TB Data SATA 3: 4TB Data SATA 4: 18TB Parity Could you please confirm whether the following steps are correct? I understand that running Preclear is advisable since the new drives are used (with two years of warranty remaining). Run a parity check Shut down the system, install the 18TB drive on SATA 4, and run Preclear Stop the array, unassign the old 4TB parity drive, and assign the new 18TB drive as parity Start the array and rebuild parity Shut down the system and replace the 4TB drive on SATA 1 with the new 18TB drive Run Preclear on the new drive, add it to the array, start the array, and format the new disk Please, note I give priority to no data loss than speed :-) Thanks! Piero