Adding a disk to ReadyNAS Pro for RAID5/6 volume expansion?

mdgm wrote:
Disk 5's partitions are 4k sector aligned. The rest are not.

this is probably caused by the fact that the original disks were formatted under an earlier FW version, and disk 5 was formatter under 4.2.15 (before I upgraded to 4.2.16), and alignment seems to have changed.
But there is still enough room. Partition 4 is 3464837120 sectors, and the geometry of disk 5 is

Disk /dev/sde: 3907029168 sectors, 1.8 TiB
Logical sector size: 512 bytes
...
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 64-sector boundaries
Total free space is 3464839277 sectors (1.6 TiB)

mdgm wrote:
1. Wait for the expansion of Volume C to complete (if it hasn't already) 2. Hot-remove (remove while NAS is on) disk 1.' wait a minute or so then hot-add the disk. 3. Wait for the resync to complete then repeat the process for disks 2, 3 and 4 waiting for the resync to complete before moving onto the next disk.

I'd have to be certain that after this open heart surgery, it will allow me to expand Volume D.
There is quite a bit of useful stuff in the expansion.log on how Vol C was extendended, so I am tempted to gain ssh access and perform the same procedure for Vol D. I am worried about the consistency of the FrontView data, though.
I hope there is an easier method.