AJA System Test fails on one or more of the external USB 3.0 hard disk drives connected under USBIF compliant USB 3.0 Hub (VIA KGH / Cypress HX3 / Microchip) which is connected to the Type-C port of Dell XPS13 running Windows 10, 64 Bit OS.
Test Setup and steps to replicate the issue:
1. Self powered USB 3.0 hub connected to the Type-C port of the Dell XPS13 using a Type-C receptacle t0 Type-C plug.
2. Four USB 3.0 Hard disk drives connected to the downstream ports of the USB 3.0 hub.
3. Following test tool is installed and run (4 instances run, one instance each for each of the hard drives connected to the Dock)
https://www.aja.com/assets/products/files/90/AJA_SystemTest-2.1.0-x64.msi
Following are the tool settings:
3a. 'Test File Size' = 512 MB
3b. 'Settings > Run Continuously' selected
The tool does continuous cycles of read / write to the selected Mass Storage device
4. USB traffic is captured on the upstream port of the USB 3.0 hub in continuous recording mode
5. One of the instances of the tool reports failure to access the drive after about 10 to 30 minutes after starting the test. Stop recording the USB traffic.
Sample set of Mass Storage devices used:
1. SinapisTek Poseidon Pocket SSD 128GB
2. Apacer AS710 USB 3.0 Portable SSD 128GB
3. Seagate Expansion 1TB HDD
4. BUFFALO HD-PZFU3 1TB HDD
Other observations:
1. Issue not seen on other Windows 10, 64 Bit platforms (Intel Series 7 chipset Desktop, latest Macbook, etc.)
2. During the test, it is seen that the data transfer to some of the devices pauses at times for no apparent reason and resumes at times. At times, it does not resume and the test fails.
3. USB trace seems to suggest issue with the host (see attached areas of concern - screenshots)
4. On data transfer failure, the disk(s) on which the failure has occurred is not accessible from windows explorer as well even as the other devices under the USB 3.0 hub continues to work.