CONFIG: I have a new 8TB Western_Digital easystore_25FB connected via USB port #1 into the back of an EX2 (Firmware Version : 2.11.164 as of 9/1/17, not Ultra). The EX2 has two WD Red 4TB spanned drives (i.e acting as a single 8TB drive).
PROBLEM: EX2 recognizes the USB but does not create a share so I cannot map to it in Win10 or use it with Time Machine.
EFFORTS TO DIAGNOSE: I had this same 8TB drive working as a USB connected to an older 4TB My Cloud Live (Firmware Version 04.05.00-315). I created the share and used it fine with that so I know the USB drive is good. I rebooted the EX2 at least once since adding the USB. I am going to add a second USB drive to port #2 (A 1TB My Book) and see if EX2 will automatically create a share for that or allow me to do it somehow. If I get different results then it may be a bad port on the EX2 or EX2 doesn’t like something about the 8TB drive.
GOAL: Attached the 8TB drive directly to the EX2 and perform backups using TimeMachine (or if that doesn’t work right FreeFileSync).