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Ifr you started with only 1 disk then you did not have Raid protection. When you put in a new disk then RAID is activated and your data gets distributed over the second hard disk as a mirror. During that time you do not have reduncancy so it will take half a day to rebuild to RAID 1.
One more thing, adding a 6 TB as disk 2 to a NAS that has a 3 TB disk 1 will not give you more disk space. It will stay 3 TB but youre data will be protected on 2 disks. You can ofcourse choose not to have RAID 1 but JOB then you will have 9 TB but no data redundacy.
In order to have 6 TB with Raid you need 2x6 TB's. But wait until the RAID has completed and the degraded message is gone to replace the 3 TB.
Omg thanks so much this really helped me alot 🙂 Can I just put another 3tb in as disc 3? So disc 1 = 3tb, disc 2 = 6tb, new disc 3 = 3tb. To get 6tb with redundancy
