The is a USB flash drive controller manufactured by Solid State Systems (often referred to as 3S). It is commonly found in older USB 2.0 drives from brands like Toshiba (TransMemory) and Kingston .
Open Device Manager, find the unknown device, view Details → Hardware Ids to get VID & PID.
Use USBView (Microsoft USB tool) to inspect string descriptors and class.
"SSS6698-BB USBDev"
When you see in Device Manager under "Universal Serial Bus Devices" or "Storage Controllers," it means the USB enumeration succeeded, but the storage class driver failed to load. Here is the breakdown: sss6698-bb usbdev