UGREEN 65733EU
UGREEN CM847 USB4 Dual-NVMe Enclosure | 65733EU
A two-bay M.2 NVMe storage dock for USB4 workflows, with up-to-40Gbps host connectivity, offline source-to-target cloning, RAID capability and active cooling.
Product introduction
Overview
UGREEN CM847, model 65733EU, is a desktop USB4 enclosure for two compatible M.2 NVMe solid-state drives. It can present installed storage to a computer for high-speed work and can also perform an offline clone from the bay marked Source to the bay marked Target.
The stated USB4 interface ceiling is 40Gbps. Real storage speed is lower and depends on the host USB4/Thunderbolt implementation, cable, bridge mode, SSD controllers, thermal state, file pattern and whether both drives are active. A USB-C-shaped host port without USB4-class capability falls back to the mutually supported link rate.
The enclosure advertises RAID capability, but the current exact listing does not establish a complete, safe mode matrix or configuration sequence. Use the labels and manual supplied with the exact unit before changing a mode. A mode change, initialization or clone operation can make data inaccessible or overwrite a target drive, so verified backups and deliberate drive placement are essential.
At a glance
Key features
Port-by-port clarity
Two drive bays, one USB4 host path and dedicated controls
Bay A / Source
Install the source M.2 NVMe drive here for offline cloning only after confirming the label on the exact unit.
Bay B / Target
The target receives the clone and can be overwritten. Confirm capacity and identity before starting.
USB4 host connection
Links the enclosure to a compatible computer at up to the mutually negotiated rate, with 40Gbps as the interface maximum.
Mode and clone controls
Use only according to the exact printed labels/manual; do not change a RAID-style mode while data is mounted or unprotected.
Clone workflow
Offline cloning is directional and destructive to the target
The exact product image labels bay A as Source and bay B as Target. Offline cloning copies the source drive onto the target without using a computer data session. It is not a bidirectional merge, selective file copy or backup that preserves existing target data.
Before starting, identify both drives outside the enclosure, confirm that the target is appropriate for a full-device copy and keep a separate backup. Do not remove power, press mode controls or disturb either drive until the device reports completion according to its exact indicator sequence.
- Source data is copied to Target, not the reverse.
- Existing target data can be overwritten.
Thermal and link management
USB4 bandwidth and active cooling support sustained storage work
The aluminium shell spreads heat while an active fan moves air through the enclosure. NVMe drives can still throttle when controller temperature rises, especially during a full clone or long write, so keep the vents uncovered and allow the unit to cool before handling internal drives.
The 40Gbps label describes the host interface. It is not a guaranteed single-drive or file-copy speed and cannot override the SSD, host, filesystem or cable. Test performance with the included/verified cable and a direct compatible host port before adding adapters.
- Keep inlet and outlet vents clear.
- Eject mounted volumes before disconnecting USB4.
Real-world applications
Use scenarios
Choose this exact model when its verified connections and limits match the workflow below.
Dual-drive workspace
Access two compatible NVMe SSDs from one USB4 host for organised project and scratch storage.
Offline migration
Clone a complete source SSD to an appropriate target without using a computer data session.
Media scratch storage
Use fast external NVMe media for high-throughput project files when the host, cable and SSDs support the workload.
Bench verification
Install and test compatible NVMe drives while monitoring identity, temperature and health before deployment.
Practical connection order
Setup and usability guidance
A deliberate connection order makes capability checks and troubleshooting easier.
- Record the model as CM847 / 65733EU and read the exact manual before opening the enclosure.
- Back up all data on any drive that will be installed.
- Verify each SSD interface, key, dimensions and intended source/target role.
- Disconnect host data and power before installing or removing drives.
- Fit drives and any verified thermal interface parts without bending the module.
- For computer access, connect directly to a compatible USB4 host and allow the OS to detect the storage.
- For offline clone, confirm A/Source and B/Target, then follow the exact button and indicator sequence without interruption.
Host and peripheral fit
Compatible devices and systems
Connector shape alone is not enough: the host port, operating system, cable, display and peripheral must support the required function.
USB4 computers
Compatible Windows, macOS or Linux systems with USB4-class data support offer the highest stated interface ceiling.
Fallback USB-C links
A slower compatible USB-C data host may negotiate a lower rate; connector shape does not guarantee 40Gbps.
M.2 NVMe drives
Use only compatible NVMe SSDs that match the exact enclosure key, interface and supported dimensions stated in its manual.
Filesystems and RAID
The operating system must support the chosen disk format or array presentation; initialization may be required for new drives.
Verified function scope
What this product does
- Houses two compatible M.2 NVMe SSDs in one USB4 desktop enclosure.
- Provides a host interface rated up to 40Gbps.
- Performs an offline one-touch clone from the labelled source bay to target bay.
- Offers RAID capability when configured according to the exact unit manual.
Boundaries that prevent a mismatch
What this product does not do
- It does not include either SSD.
- It does not make a SATA M.2 drive compatible merely because it fits physically.
- It does not guarantee 40Gbps application or file speed.
- It does not preserve existing target data during a full offline clone.
Recommended practice
What to do
- Keep an independent backup before clone or RAID operations.
- Label source and target drives before installation.
- Use a direct compatible USB4 host connection for performance testing.
- Keep fan vents clear and place the enclosure on a hard surface.
Avoid common mistakes
What not to do
- Do not guess the RAID mode or change a switch while volumes are mounted.
- Do not reverse Source and Target during offline cloning.
- Do not remove power during a clone, rebuild or write.
- Do not install an unverified SATA M.2 drive.
Read before use
Warnings and limitations
Check before connecting or ordering
- The live variant SKU field is blank; match CM847 and 65733EU on the title, enclosure or retail package.
- SSDs are not included.
- Use M.2 NVMe drives only; do not assume a physically similar SATA M.2 drive is supported.
- Verify supported key, length, capacity and any required thermal pad in the exact manual before installation.
- Offline clone is Source-to-Target and can overwrite the entire target.
- Back up both drives before any mode change, initialization or cloning operation.
Warning / limitation 1
Offline cloning can irreversibly overwrite the target drive.
Warning / limitation 2
Changing storage mode can require reinitialization and can make existing data inaccessible.
Warning / limitation 3
An NVMe SSD can become hot during sustained writes; allow cooling before handling.
Warning / limitation 4
USB4 performance varies with host, cable, SSD, filesystem, thermals and simultaneous drive activity.
Model-specific data
Technical specifications
| Specification | Verified detail |
|---|---|
| Brand / model | UGREEN CM847 / 65733EU |
| Live Shopify SKU field | Blank; model verified from active title, handle and exact media |
| Product type | Dual-bay M.2 NVMe SSD enclosure / storage dock |
| Host interface | USB4, up to 40Gbps |
| Drive bays | 2 × M.2 NVMe |
| Offline clone | One-touch Source A to Target B |
| RAID | RAID capability; exact modes and switch sequence must be checked in the unit manual |
| Cooling | Active fan plus aluminium enclosure |
| Included storage | None; SSDs not included |
| Host requirement | Compatible USB data host; USB4-class host/cable required for the stated interface ceiling |
| Data safety | Backup required before clone, mode change or initialization |
Verified in-box information
Package contents
- 1 × UGREEN CM847 / 65733EU dual-bay USB4 NVMe enclosure.
- 1 × USB-C host cable as shown with the exact product.
- Drive-installation parts and documentation only as supplied with the exact retail unit.
No M.2 NVMe SSD is included. Exact screws, thermal pads, power equipment and manual contents should be checked against the sealed regional package before installation; the current record does not safely enumerate them.
Model-specific answers
Product-specific FAQ
Are SSDs included with CM847?
No. The enclosure is supplied without SSDs.
Does it support SATA M.2 drives?
The exact product is described for M.2 NVMe. Do not install a SATA M.2 drive unless the exact manual explicitly lists it.
Will every USB-C port run at 40Gbps?
No. The host and cable must support a USB4-class link. A slower compatible port negotiates a lower rate.
Is 40Gbps the file-copy speed?
No. It is the host-interface maximum. SSD, bridge, host, filesystem, files and temperature determine practical performance.
Which direction does offline clone run?
Exact media labels bay A as Source and bay B as Target. Confirm those labels on your unit before starting.
Will offline clone preserve files already on the target?
No. Treat the operation as destructive to the target and keep a separate backup.
Can I clone a larger source to a smaller target?
Do not assume so. A full-device clone normally requires an appropriate target capacity; confirm the exact manual before starting.
Which RAID modes are supported?
The product advertises RAID capability, but this description does not guess the mode matrix. Follow the exact labels and manual supplied with CM847.
Why is a new SSD not visible in the operating system?
It may need initialization, or the drive/interface may be incompatible. Verify the disk identity and enclosure support before formatting anything.
Does the fan prevent all thermal throttling?
No. Active cooling helps, but sustained transfers, ambient temperature and SSD design can still reduce speed.
Is RAID a backup?
No. RAID can change capacity or availability characteristics, but it does not replace a separate, verified copy of important data.
