If your USB-A device is not being detected through the USB-C to USB 3.0 Adapter Cable (ST-UCATCM), the usual causes are a connector that is not fully seated, a USB-C port on your computer that only carries power, or a peripheral drawing more power than the port can supply. The USB-C to USB 3.0 Adapter Cable is plug-and-play with no drivers or software required on macOS, Windows, or Chrome OS, and it supports data transfer at up to 5 Gbps.

How to fix detection problems with the USB-C to USB 3.0 Adapter Cable

1. Reconnect the USB-C end firmly so it makes full contact, and check the USB-C port on your computer for dust or debris.
2. Try a different USB-C or Thunderbolt port. Some USB-C ports are charge-only and do not carry data, which stops any connected accessory from appearing.
3. Plug a different USB-C accessory into the same port to confirm the port itself is working.
4. Connect the USB-C to USB 3.0 Adapter Cable directly to your computer while testing, with no hub or extension in the chain.
5. Restart your computer, then reconnect the adapter cable.
6. On Windows, open Device Manager and expand Universal Serial Bus controllers. Look for "USB 3.0 Hub" or "Generic SuperSpeed USB Hub." If it is missing, select Scan for hardware changes.
7. On macOS, open System Report, go to USB, and confirm the adapter appears in the USB Device Tree.
8. Test one peripheral at a time. Disconnect your other USB devices, then plug in a low power device such as a flash drive or a mouse to confirm the adapter cable works.
9. For an external hard drive, connect it through a powered USB hub. A high power drive can exceed what your computer's port supplies on its own.
10. If a drive connects but does not appear, open Disk Utility on a Mac and check for it under external volumes, or open Disk Management on Windows and verify the drive letter assignment.
11. Do not expect charging or video. The USB-C to USB 3.0 Adapter Cable is made for data transfer only, so it does not charge your device and does not support video output to external displays.
12. If transfers feel slow, check both ends. Reaching up to 5 Gbps requires the host USB-C port and the connected USB-A accessory to both support USB 3.0. A USB 2.0 device runs at USB 2.0 speeds, up to 480 Mbps.