UGREEN CM812 45167 4-in-1 USB-C/USB-A Card Reader & Hub
Overview
UGREEN 45167 is a four-port reader/hub with two USB-A data ports, one SD slot and one microSD/TF slot. This model guide separates connector bandwidth from real card performance and explains every important compatibility boundary before you move valuable files.
- SKU 45167
What it does well.
Key features
Reader role. a four-port reader/hub with two USB-A data ports, one SD slot and one microSD/TF slot.
Host connection. integrated host cable with USB-A connection and a supplied/tethered USB-C host adapter; use one host connector at a time.
Card layout. 1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage.
Practical speed. Up to 170MB/s is advertised for a suitable high-speed card/host path. USB 5Gbps is not the same as sustained card throughput.
Model check: Similar-looking UGREEN readers can differ in host plug, card protocol, simultaneous access, extra USB ports and charging. Match SKU 45167 rather than buying by appearance alone.
Ports, slots and connection map
Host side: integrated host cable with USB-A connection and a supplied/tethered USB-C host adapter; use one host connector at a time.
Reader and accessory side: 1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage.
Extra function: The two USB-A sockets are data ports. This product has no PD input, HDMI, Ethernet or advertised host charging.
Direction rule: A card reader is a host accessory. It must connect to a device that can act as a USB host; connecting two accessories together does not create a host.
Speed explained without the marketing blur
USB/interface ceiling. Up to 5Gbps USB 3.0/3.2 Gen 1-class link, shared by the reader slots and two USB data ports.
Memory-card ceiling. Up to 170MB/s is advertised for a suitable high-speed card/host path. USB 5Gbps is not the same as sustained card throughput.
UHS generation.
Real-world result. The slowest link wins: card, slot mode, reader controller, host port, file system, thermal state, file sizes and simultaneous activity all matter.
Never equate 5Gbps or 10Gbps with card speed. USB values describe theoretical link signalling. SD and microSD media usually operate at much lower sustained rates, and many small files transfer more slowly than one large sequential file.
Card formats, capacity and file systems
Supported card families. SD, SDHC, SDXC, MMC/RS-MMC; microSD/TF, microSDHC and microSDXC.
Capacity boundary.
File-system caveat. The card must use a format the host understands. exFAT is common for large removable media; FAT32 has file-size limits; NTFS and vendor-specific formats may not mount on phones/tablets.
Write-protect reminder. A full-size SD card with its lock tab engaged may be readable but not writable. The reader cannot override the card's mechanical write-protect state.
Simultaneous access and shared-resource behaviour
Shared bandwidth. Two cards or attached peripherals divide the bandwidth available through the single host connection.
Shared power. Bus-powered readers and USB peripherals depend on host power. High-draw drives may disconnect or fail to mount without an appropriate powered path.
Copying card-to-card. The computer or mobile host mediates the copy. The reader is not an autonomous duplicator and does not copy files when disconnected from a host.
Safest workflow. For irreplaceable media, copy one card, verify the files, create a second backup and only then erase or reformat the original.
Compatible devices and systems
Compatible device class: USB-C or USB-A computers, supported USB-C iPhone/iPad and OTG-enabled USB-C phones/tablets.
Operating systems: Windows, macOS, Linux, ChromeOS, iPadOS and Android on compatible USB data/OTG hosts..
Mobile rule: A mobile device must support USB host/OTG, the card file system and enough bus power for every connected USB peripheral.
USB-C is only a shape. A USB-C port can be charging-only, data-capable, OTG-capable or video-capable. Confirm the host function.
Apps and permissions. On phones/tablets, use Files, Photos or the manufacturer's supported file manager and allow removable-storage access when prompted.
Cases and clearance. A thick case can prevent full plug insertion. Remove it temporarily rather than forcing the connector.
Managed devices. Corporate policy, encrypted cards or restricted mobile profiles can block removable media even when hardware is compatible.
Use scenarios
Scenario 1. Import SD footage while a USB mouse is connected.
Scenario 2. Move microSD files to a USB flash drive.
Scenario 3. Use one reader with USB-C and USB-A computers.
Scenario 4. Add two USB data ports to an OTG-enabled tablet.
Setup and usability guidance
- Confirm SKU 45167, the required host connector and the card format before insertion.
- If using a phone or tablet, enable or confirm OTG/USB-host storage and make sure the battery has enough charge.
- Insert the memory card straight into its matching slot in the orientation shown by the slot label. Never force it.
- Connect the reader to the host. Wait for the removable volume to appear in Files, Finder, File Explorer or the supported mobile app.
- Copy a small test file first. Then start the main transfer and keep the device, cable and cards still.
- Verify copied folders, file counts and several representative files before treating the transfer as a backup.
- Use Eject or Unmount, wait for activity to finish, then disconnect by the connector housing rather than the cable.
What this product does
- a four-port reader/hub with two USB-A data ports, one SD slot and one microSD/TF slot.
- Provides 1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage.
- Works within the documented speed and compatibility limits.
- Supports the stated host and card families when the operating system can mount them.
- not a charger, display adapter, UHS-II reader, powered hard-drive dock or way to exceed the connected host/card limits.
- It does not repair corrupted media, recover deleted files or guarantee that damaged cards will mount.
- It does not make one copy into a backup; keep another copy on separate storage.
- It does not guarantee every illustrated device, card capacity or speed without the required host capability.
What to do
Do: label cards. Separate blank, active and backed-up cards. Locking or labelling completed media prevents accidental erasure.
Do: verify before erasing. Open several copied files and compare counts or checksums for critical work.
Do: keep connectors clean. Use a dry, dust-free environment and store the reader where slot contacts are protected.
Do: eject safely. Unmount every active volume and wait for activity to stop before removal.
Do not: remove during writing. Disconnecting during import, deletion, formatting or metadata updates can corrupt the file system.
Do not: force media. Wrong orientation or the wrong card family can bend contacts or crack the card.
Do not: format the wrong disk. Confirm the volume name, capacity and path before erase or format operations.
Do not: trust one copy. Portable cards fail, get lost and can be overwritten. Maintain a separate backup.
Warnings and limitations
Heat and moisture: keep the reader dry and ventilated. Mild warmth during sustained transfer can be normal; disconnect if there is unusual heat, smell, deformation or repeated resets.
Power: The two USB-A sockets are data ports. This product has no PD input, HDMI, Ethernet or advertised host charging.
Card handling: do not touch contacts, bend cards, use cracked adapters or insert nested adapters that do not fit cleanly.
Formatting: formatting deletes the file-system index and can make recovery difficult. Back up first and confirm the target device's preferred format.
Critical data: no reader can guarantee recovery from failing media. Stop repeated write attempts on a card showing errors and seek professional recovery help if the files are irreplaceable.
Troubleshooting
Card does not appear. Reseat the card and reader, confirm slot orientation, test one card at a time, remove an obstructing case and check OTG/file-system support.
Card is read-only. Check the SD lock tab, operating-system permissions, card health and whether the file system was mounted read-only after errors.
Transfer is slower than expected. Use one card, a direct high-speed host port and large sequential files; confirm the card's own sustained rating and negotiated UHS mode.
Reader disconnects. Remove high-power USB peripherals, connect a suitable PD/powered path where this model supports it, and avoid loose extensions.
Phone cannot see files. Use the Files/Photos app, enable OTG, grant storage permission and verify the card uses a phone-supported format such as exFAT/FAT32.
Copied file will not open. Compare the original, copy again to a different destination and stop using a card that reports I/O, CRC or corruption errors.
Final model check
Confirm SKU 45167, integrated host cable with USB-A connection and a supplied/tethered USB-C host adapter; use one host connector at a time, and 1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage. Then match the UHS mode, capacity, simultaneous-access rule and mobile/charging requirements before ordering.
At a glance.
- Brand / SKU
- UGREEN 45167
- Product role
- a four-port reader/hub with two USB-A data ports, one SD slot and one microSD/TF slot
- Host connection
- integrated host cable with USB-A connection and a supplied/tethered USB-C host adapter; use one host connector at a time
- Slots / ports
- 1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage
- Simultaneous behaviour
- gallery shows SD and TF together and multiple USB peripherals. Concurrent activity is supported within the shared host power and bandwidth.
- Interface ceiling
- Up to 5Gbps USB 3.0/3.2 Gen 1-class link, shared by the reader slots and two USB data ports.
- Card performance
- Up to 170MB/s is advertised for a suitable high-speed card/host path. USB 5Gbps is not the same as sustained card throughput.
- UHS/card mode
- gallery shows common SD/SDHC/SDXC and microSD/TF families but does not establish UHS-II operation. Do not infer UHS-II from 170MB/s artwork alone.
- Card formats
- SD, SDHC, SDXC, MMC/RS-MMC; microSD/TF, microSDHC and microSDXC.
- Operating systems
- Windows, macOS, Linux, ChromeOS, iPadOS and Android on compatible USB data/OTG hosts.
- Build
- black portable hub body, integrated dual-host cable arrangement, two USB-A sockets and front SD/TF slots
- Model
- CM812 / 45167
- Host options
- USB-A or USB-C; one at a time
- Reader slots
- 1 × SD; 1 × microSD/TF
- USB data ports
- 2 × USB-A 3.0
- Shared interface ceiling
- Up to 5Gbps
- Maximum advertised card speed
- Up to 170MB/s with suitable equipment
- Advertised card capacity
- Up to 2TB
- PD/video/Ethernet
- Not provided
1 × UGREEN CM812 45167 reader/hub with USB-C host adapter arrangement
Memory cards, phone, tablet, computer, camera, charger, external drive and other illustrated accessories are not included unless explicitly named above or in the selected offer.
Questions buyers ask.
What exactly is UGREEN 45167?
a four-port reader/hub with two USB-A data ports, one SD slot and one microSD/TF slot.
Which host connection does it need?
integrated host cable with USB-A connection and a supplied/tethered USB-C host adapter; use one host connector at a time.
Which card slots or ports are provided?
1 × full-size SD; 1 × microSD/TF; plus 2 × USB-A 3.0 data ports for peripherals or storage.
Can it access more than one card at a time?
Is 5Gbps the actual card speed?
No. Up to 5Gbps USB 3.0/3.2 Gen 1-class link, shared by the reader slots and two USB data ports. Up to 170MB/s is advertised for a suitable high-speed card/host path. USB 5Gbps is not the same as sustained card throughput.
Does it support UHS-II speed?
What card formats and capacities can I use?
Will it work with a phone or tablet?
A mobile device must support USB host/OTG, the card file system and enough bus power for every connected USB peripheral.
Which file system should I use?
Use a format supported by both the host and destination device. exFAT is common for large removable media; FAT32 has a 4GB single-file limit; NTFS often fails on phones/tablets.
How should I remove a card safely?
Finish every transfer, close apps using the volume, choose Eject or Unmount, wait for activity to stop, then remove the card and reader without pulling the cable.
What is included in the package?
1 × UGREEN CM812 45167 reader/hub with USB-C host adapter arrangement.