Dual dock disappearing from PC

I have 2 Dual hard drive docks both by Wavlink. A ST342U and a ST341U. The ST342U I have had no problems with but just got the 341 which is reported by Windows as a J Micron SCSI adapter. The 342 is just reported as USB mass storage device in device manager.

The 341 keeps disappearing from file explorer and I am planning on returning it when reading large files with teracopy.

Anyone know if the J Micron controller is problematic as I have found another Wavlink similar to the 342 which I will test.

There are unconfirmed reports that some J Micron USB chips have issues with SOME USB controllers, and every motherboard may have a different USB controller. The raspberry Pi forum suggests using AS Media based hardware if you have issues with J Micron.
https://forums.raspberrypi.com/viewtopic.php?t=332353

In your Windows system go to Device Manager, open your "USB mass storage device" and double click, on the details tab choose "Hardware IDs"

You should see USB\VID_xxxx&PID=_yyyyy

What replaces the xxxx in the VID area is the "Vendor ID" and you should be able to search that on the web and work out the manufacturer. (PID is Product ID).

Intel is usually 8086 as the vendor ID

Thanks for that I will investigate but Linux lsusb says both docks are J Micron one says SCSI Bridge the other just says External. The SCSI bridge is the problem one which is being returned for an ST334UA.

Well have received the ST334 from seller and according the Linux it has AS Media chip 6gb bridge. So testing now, been attached for 4 hours verifying files so seems ok.

In reply to a post by jchamier:

There are unconfirmed reports that some J Micron USB chips have issues with SOME USB controllers, and every motherboard may have a different USB controller. The raspberry Pi forum suggests using AS Media based hardware if you have issues with J Micron.
https://forums.raspberrypi.com/viewtopic.php?t=332353

have seen a 66gb tar file fail downloading to a ssd powered by an jmicron usb to sata controller.

It's happened again in Windows. Got rid of the JMicron USB dock by way of leaking roof and replaced with another AS Media dock. New Toshiba NAS drives and in the middle of copying files Teracopy says no destination.

Repeated the copy in Linux and it completed, now verifying copies has to be a Windows bug?

May have a clue what's going on with windows. In the event log windows is trying and failing to page memory to the external USB HDD while the copy is running. This shouldn't be happening so have disabled "Let windows manage paging on all disks" in Advanced Performance settings and ensured all drives are set to 'none' except C:. Have sent feedback with my findings via the feedback hub. See if this cures it.

do a mem86 test (sorry brain is not functioning)

edit

do a chkdsk on the usb drive

Edited by Taras (Sun 17-May-26 09:14:23)

First thing I did when it happened.

try a chkdsk on the usb drive.

is it a spinner or chips ?