USB 3 external drive volume not mounting on restart

I've bought an external USB 3 full size hard drive enclosure case and put in a 2TB drive. The drive is partitioned into 3 volumes. I've noticed from time to time that the volumes have gotten dismounted some how. If I unplug the USB cable and plug it back in the volumes mount again. After a long time I finally figured it out that what's really happening is that the volumes are not mounting when I do a restart, I just didn't notice it before. Once the volumes are mounted they stay mounted until the next restart. I replaced the enclosure and cable with a different and more expensive brand but that didn't make a difference. No matter what I do the volumes never mount on restart.

I think this might be due to the fact that my iMac as a fusion drive and it boots so fast that the exteranl drive isn't finished starting up when OS X is looking for drives durring it's bootup.

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