I have bought and used many external hard drives, such as the traditional ones like Seagate Backup Plus 2TB, or the Samsung SSD T1 with 512GB, and all of them can be repartitioned using Mac's Disk Utility as ExFAT, and be immediately used as an external hard drive by both the Mac and the PC (using Windows 7).
But this time I bought a Samsung EVO 850 internal SSD drive, and using a case (such as the Anker or the Inateck), it is said to be able to function as a USB 3.0 SSD external drive, but after I partition it as ExFAT, when I copy files in, the Mac keep on asking for password and saying I can copy, but the files won't be visible. When the drive is plugged into a different Mac, I cannot read those files either.
So how to make this internal SSD drive work just like any other external SSD drive?