In theory, up to six devices can be daisy chained from a single Thunderbolt port. With five 4 TB drives per enclosure and twelve enclosures total filling both ports, we should have had a single 240 TB volume running from our laptop. However, under Mac OS 10.7.5, Mihalik could get no more than six enclosures working, regardless of whether that was a 1 x 6 or 2x 3 configuration. It should work, but it doesn’t. With 10.8.2, we could see drives in all twelve enclosures, but only drives in eleven enclosures would mount. Specifically, we could see 59 of the 60 drives in play, but it takes all five drives to make one 5big enclosure work properly, so we effectively were left with 220 TB of active storage in one volume. Mihalik believes we may have stumbled across either a driver or OS bug, and he’s currently following up with Apple.