Hi, I recently moved to a 2018 Mac Mini (i7, 16GB Ram, 512GB SSD) from an i7 iMac late 2012. I am experiencing extremely slow file transfers on my external attached Hard Drives. Previously on my iMac everything felt fast and efficient. However on the Mac Mini its not so. I have 2 WD Ultra Portable HDD's connected via USB 3.0 on my CalDigit TS3+. The TS3+ is connected via Thunderbolt 3. I have a 4TB WD My Book connected direct to the Mac Mini's 3.0 port. I have a 4TB WD Passport connected via USB 3.1 and a Samsung T5 connected via USB-C. Copying a 3.2GB file from the 4TB My Book to the 4TB Passport takes over 10 minutes. Same file copied between the T5 and the internal SSD and vice versa takes 5 secs. The file from the T5 to the Ultras takes less than a minute. I would expect the file to take no more than 2-3 minutes to transfer via USB 3 to between the two 4TB drives, not over 10? Any ideas?