I have a WD My book world edition II (white light) 2Tb, and I wanted to upgrade HD’s with 2x2Tb WD Caviar Green (WD20EAR). However, when I replace HDs (brand new), the box did not boot up and WD Discovery can not detect HDs.

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When I use one old and one new HD in the box, box boots up, In the configration menu old hd 1TB new one 2Tb shows and as usual raid 1 capacity is 1Tb. When I put second new HD in the box, the box boots up, Disk manager shows each HDs as 2TB as normal.

However, Raid 1 capacity still 1 Tb with 2x2Tb HDs. Any solution to increase Raid 1 capacity?

Feb 09, 2015  Western Digital MyBook Duo: Replace Hard Drives So, it turns out that I under-estimated the amount of space I needed, so now it's time to upgrade the two 2GB HD's that came with the MyBook Duo.

When I configure the box raid 0 or JBOD capacity stucks on 2TB not 4TB. Finally I did it, Ok. You have 2x2TB HDs and raid 1 shows as 1 TB because of mirrored from 2x1TB HDs. Connect one of 2TB HD computer’s sata port2. Boot from Slax live cd, then from terminal panel run cfdisk /dev/sda.Delete largest partition (sd4) and create new one as default then change to “Type” as FD.Write to partition table,.Quit.Do same for 2nd HD.Install 2 HDs in to the box, reset.Goto configuration menu re-raidSo you may use any size of HD with WD mybook world edition II (white light).