After you have purchased this product, discard the cable that came with it. I couldn't get a steady speed until I connected it to the USB 3.1 Gen 2 SuperSpeed 10Gb/s cable I got from Monoprice (same great results with USB 4.0 at 500Mb/s read/write ). My problem is indeed with the JMS850 controller which tends to shut down due to the random file transfer load. I can move a few 5-10GB files, go away for a moment to do something else, and come back with a drive that the OS doesn't recognize. In this case I have to unplug the drive and plug it back in. I've checked the board and can't find anything wrong, my only suspicion is that there is an occasional short that justifies the drive's strange behavior. I shouldn't have as many problems if other drives I have that can support 5Gb/s on their controllers are stable.
π StarTech.com 3.5in Silver Aluminum USB 3.0 External SATA III SSD / HDD Enclosure with UASP - Portable USB 3 3.5" SATA Hard Drive Housing (S3510SMU33)
10 Review
Samsung T5 Portable SSD MU PA500B
88 Review
SAMSUNG T7 Touch Portable SSD π½ 2TB: High-speed, Secure & Compact Solid State Drive!
17 Review
SAMSUNG T7 Portable SSD 1TB: Fast and Reliable USB 3.2 External Solid State Drive in Gray
13 Review
π Seagate Expansion 3TB Portable USB 3.0 External Hard Drive (STEA3000400) in Black
60 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review