Lacie Has Solved My Big5 Problem Using El Capitan 10.11
When I upgraded to El Capitan my computer would not recognize my Big5 Thunderbolt 2 Drives. After several weeks of discussion with the technical department at Lacy they concluded that an upgrade in firmware was required to solve the problem of drive identification.
Correct firmware is 2.0.3.1057. Most hard drives are carrying 2.0.3.1056
Link to the firm is below:
Firmware: http://www.lacie.com/files/lacie-content/download/drivers/5big-firmware.bin
Mac Pro (Late 2013), OS X El Capitan (10.11.1), Lacie Big5 Thunderbolt 2