UGREEN USB-C SD/TF reader


Most of UGREEN devices are high quality, but the reader I’ve received is not working well.

Here are the specifications:

  • Input: USB Type C 3.1 Gen1 male with data transfer rates up to 5Gbps
  • Output: TF/SD card slot
  • Supports Micro SD (TF)/SD cards
  • Supports simultaneously read and write on two cards
  • Supports hot-swapping (even if not recommended)
  • Supports Windows/Mac OS/Linux
  • Dimensions: L62xW21xH10.4(mm)

The reader is not detected at all by all the four USB Type C ports of a MacBook Pro 15-inch 2017:

 UGREEN USB-C SD/TF reader test with MacBook Pro 15-inch 2017
UGREEN USB-C SD/TF reader test with MacBook Pro 15-inch 2017

Not listed in the USB devices:

laptop:~ moore$ ioreg -p IOUSB 
+-o Root  <class IORegistryEntry, id 0x100000100, retain 17>
  +-o AppleUSBXHCI Root Hub Simulation@00000000  <class AppleUSBRootHubDevice, id 0x1000003eb, registered, matched, active, busy 0 (111 ms), r$
  +-o AppleUSBXHCI Root Hub Simulation@01000000  <class AppleUSBRootHubDevice, id 0x1000003f7, registered, matched, active, busy 0 (97 ms), re$
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, id 0x100000425, registered, matched, active, busy 0 (125 ms), r$
    +-o iBridge@14200000  <class AppleUSBDevice, id 0x10001a703, registered, matched, active, busy 0 (207 ms), retain 59>

I think the problem is coming from the length of the USB-C connector. It seems the USB connector is too short (model received):

USB-C connector issue UGREEN USB-C SD/TF reader
USB-C connector issue UGREEN USB-C SD/TF reader

The only way to make it working is to use a Male-Female UGREEN USB Type C cable:

Workaround with a cable  UGREEN USB-C SD/TF reader
Workaround with a cable UGREEN USB-C SD/TF reader

After applying the workaround by plugging an extra USB male-female cable:

laptop:~ moore$ ioreg -p IOUSB 
+-o Root  <class IORegistryEntry, id 0x100000100, retain 17>
  +-o AppleUSBXHCI Root Hub Simulation@00000000  <class AppleUSBRootHubDevice, id 0x1000003eb, registered, matched, active, busy 0 (111 ms), r$
  | +-o USB3.0 Card Reader@00100000  <class AppleUSBDevice, id 0x10002711e, registered, matched, active, busy 0 (32 ms), retain 20>
  +-o AppleUSBXHCI Root Hub Simulation@01000000  <class AppleUSBRootHubDevice, id 0x1000003f7, registered, matched, active, busy 0 (97 ms), re$
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, id 0x100000425, registered, matched, active, busy 0 (125 ms), r$
    +-o iBridge@14200000  <class AppleUSBDevice, id 0x10001a703, registered, matched, active, busy 0 (207 ms), retain 59>


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