Chosen Solution
I have tried 3 USB 3.0 to MSATA external SSDs. None will allow me to format them (8TB & 16TB). I formated one of the 16TB on a PC but when I connected to my early 2015 13" MacBook Pro Retina it first saw the external SSD, but then was lost and cannot write to it. Is the MacBook Pro (A1502) compatible with external MSATA SSD drives? If not, is there anything I can do so that my MacBook Pro can read and write to these drives? Thanks.
From the sounds of it you used a Windows file system which has its own quirks! What is the disk format? MBR or GUID? And the file system Windows :FAT or NTFS and for Mac: HFS+ or APFS? Apples file systems (which require GUID) go to the exabyte level so I can’t see you having any issues within OS-X or macOS natively using HFS+ or APFS. SATA or mSATA have no bearing here as that’s just the physical interface at the drive level. What is the your plan here? As you appear to be dancing between platforms.
