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I have bought ReadyNAS 312 with 2 2TB WD disks and set up already, but I only can access the 1.8TB free memory, I do not find the 4TB disk in my computer.
I have bought ReadyNAS 312 with 2 2TB WD disks and set up already, but I only can access the 1.8TB free memory, I do not find the 4TB disk in my computer.
You are not accessing "free memory", you are in fact accessing the drive.
If you are using XRAID, your 2x2TB array will be set up with RAID-redundancy - allowing you to access the data even if one disk fails. As a consequence, the amount of storage is reduced to 2 TB.
Windows (and the NAS) report storage in TiB (1024*1024*1024*1024 bytes). The disk drive folks use TB (1000*1000*1000*1000 bytes). 2 TB of space is the same as 1.8 TiB. This can be confusing, as (like Windows) the ReadyNAS just uses TB.
One option is to get larger drives. 2x4TB would get you the 4 TB you want, with the benefits of RAID redundancy.
You can alternatively use the admin web ui to switch to flexraid, destroy the data volume, and change the NAS over to jbod. Then you'd have 4 TB (3.6 TiB) of space on two volumes. You'll lose the benefits of RAID redundancy.
Note you can also use RAID-0 to get a single 4 TB volume. I don't recommend that - if either drive fails you lose all your data.
