I've bought an RT-AC86U and have 384.11_2 AsusWRT Merlin installed on it. I've got two disks, a HDD and a USB3.0-enabled SSD. The HDD has just one HFS+ partition (sda1, used for Time Machine). The SSD is partitioned into two partitions, one HFS+ (sdb1, used for general file storage) and another...