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Names the capacity rule for cloning inside the cloning bullet

UGREEN dual-bay SATA dock, USB 3.0 at 5 Gbps, offline clone, UASP, S.M.A.R.T. and TRIM, 2 × 16 TB

A two-bay dock that puts the cloning rule in bold inside its own first bullet — the destination has to exceed the source — and publishes three protocols where most docks publish one.

UGREEN black dual-bay drive docking station with two slots and a clone button

UGREEN dual-bay SATA dock, USB 3.0 at 5 Gbps, offline clone, UASP, S.M.A.R.T. and TRIM, 2 × 16 TB

A two-bay dock that puts the cloning rule in bold inside its own first bullet — the destination has to exceed the source — and publishes three protocols where most docks publish one.

Bay count
Two — stated in the title and in the second bullet, which describes simultaneous operation of two 2.5-inch or 3.5-inch drives for synchronous data transfer
Supported drive sizes
2.5-inch and 3.5-inch — stated in the first and second bullets
Supported drive interfaces
SATA hard discs and solid-state drives — stated in the first and second bullets. No SATA revision is named
Solid-state slot support
Not published on the listing — no M.2 position is named. Solid-state drives are supported in the two SATA bays and no separate slot exists
Offline cloning
Stated — the first bullet describes fast copying between two drives at a single button press with no computer connected, and adds in a marked note that the capacity of destination drive B must exceed that of source drive A
Interface standard
USB 3.0 — stated in the title and in the third bullet
Stated link rate
Up to 5 Gbps — stated in the title and in the third bullet, which calls it a theoretical transfer speed
Connector type
Not published on the listing — no socket and no cable is named in any bullet
UASP support
Stated — the third bullet names UASP, S.M.A.R.T. and TRIM together as the protocols supported. It is one of two docks on this shelf to name all three
Power supply
Not published on the listing — no adapter, no voltage and no current is named, on a dock stated to run two 3.5-inch drives at once
Per-bay controls
Not published on the listing — no power switch and no per-bay indicator is named in any bullet
Amazon reference
B0FPM32XNZ (same reference on 5 Amazon marketplaces)
EAN
6941876284924
  • Puts the capacity rule for cloning inside the cloning bullet, in a marked note
  • UASP, S.M.A.R.T. and TRIM all three published
  • No power supply named, on a dock built for two 3.5-inch drives

Best for: Moving a system onto a larger drive, where the capacity rule in the first bullet is exactly the thing that has to be got right.

≈ 24 €
Check price on Amazon

Specifications

Bay count
Two — stated in the title and in the second bullet, which describes simultaneous operation of two 2.5-inch or 3.5-inch drives for synchronous data transfer
Supported drive sizes
2.5-inch and 3.5-inch — stated in the first and second bullets
Supported drive interfaces
SATA hard discs and solid-state drives — stated in the first and second bullets. No SATA revision is named
Solid-state slot support
Not published on the listing — no M.2 position is named. Solid-state drives are supported in the two SATA bays and no separate slot exists
Offline cloning
Stated — the first bullet describes fast copying between two drives at a single button press with no computer connected, and adds in a marked note that the capacity of destination drive B must exceed that of source drive A
Interface standard
USB 3.0 — stated in the title and in the third bullet
Stated link rate
Up to 5 Gbps — stated in the title and in the third bullet, which calls it a theoretical transfer speed
Connector type
Not published on the listing — no socket and no cable is named in any bullet
UASP support
Stated — the third bullet names UASP, S.M.A.R.T. and TRIM together as the protocols supported. It is one of two docks on this shelf to name all three
Power supply
Not published on the listing — no adapter, no voltage and no current is named, on a dock stated to run two 3.5-inch drives at once
Per-bay controls
Not published on the listing — no power switch and no per-bay indicator is named in any bullet
Amazon reference
B0FPM32XNZ (same reference on 5 Amazon marketplaces)
EAN
6941876284924

On the listing

A drive docking station with USB 3.0 at 5 Gbps, dual bay and offline cloning, allowing fast data copying between two 2.5-inch or 3.5-inch SATA HDDs or SSDs at a single button press without a computer, with a marked note that the capacity of destination drive B must exceed that of source drive A; simultaneous operation of two drives for synchronous transfer; support for UASP, S.M.A.R.T. and TRIM over a USB 3.0 interface with theoretical speeds of up to 5 Gbps; compatibility with Windows from XP, Linux and macOS with no driver installation; and support for two 16 TB drives, giving up to 32 TB.

The rule, printed where it is needed

The first bullet describes the clone and then, in a marked note, states the condition it depends on.

The capacity of the destination must exceed that of the source.

That is the sentence people find out about afterwards. A block-level copy needs room for the whole source drive, empty space included, so a 4 TB disc will not clone onto a 2 TB one however little is actually stored on it.

Three of the five cloning docks in this hub state the rule somewhere. This one states it inside the bullet that describes the button, which is where somebody about to press it will actually read it.

What the same bullet calls it

The bullet also calls the operation a backup, and that word is the maker’s rather than this site’s.

A clone is a duplicate made at one moment, on the same desk, from a source that is copied exactly as it is. It keeps no earlier version of a file overwritten this morning. It does not survive the flat being burgled, because both drives go. It reproduces corruption without noticing it.

Those are the situations a backup arrangement is built to survive, and a dock is not one. What it is good at — moving a system to a larger drive, making an identical spare, reading old discs — is genuinely useful and is a different job.

Three protocols

The third bullet names UASP, S.M.A.R.T. and TRIM.

That is a fuller set than most docks publish. UASP changes how commands are queued and is the difference between a fast drive behaving like one and behaving like a memory stick. S.M.A.R.T. passes the drive’s own health data through to the computer, which on a dock used to read old discs is the feature that tells you which of them is dying. TRIM keeps a solid-state drive’s write performance from degrading.

S.M.A.R.T. in particular earns its place here. A dock is where drives of unknown history get plugged in, and being able to read their reported hours and error counts is the reason to plug them in at all.

Thirty-two terabytes, and no adapter named

The fifth bullet gives two 16 TB drives.

And no bullet anywhere names the power supply. Two 3.5-inch mechanisms spinning up together are well beyond what a USB port provides, so an adapter must be in the box; its voltage and current are simply not published, as on four of the seven docks in this hub.

Two docks here do publish theirs. Where a dock is expected to run two large mechanisms simultaneously, that figure is the difference between reliable operation and drives that drop out under load.

Before ordering

Check which drive is larger before pressing anything, because the destination has to exceed the source and its contents are gone. Ask what adapter is supplied and how it is rated. And treat the clone as a duplicate rather than as a backup, whatever the bullet calls it.

Availability

Priced from 24 € to 38 € across the German, French and Italian Amazon stores the day this page was checked.

The Spanish Amazon price runs past 1.6× the cheapest store. A gap that size normally marks a reshipper and not a seller in the country, so that listing stays out of the range above.

In the British Amazon catalogue with no live offer against it: the reference exists, nobody is filling it.

The American Amazon store returned nothing at all, so the buy button there opens a search in that country rather than a page that would not load.

Every figure in this section is what Keepa held on the day this page was last updated. Stock and prices move without warning.

Prices quoted in this text were read on 10 September 2026. The live price is at the top of the page.

More drive docks

  • Xiaobi dual-bay drive docking station with RGB lighting and two drive slots

    xiaobi dual-bay SATA dock, USB-C and USB-B, USB 3.0 at 5 Gbps, offline copy, RGB switch

    The dock that describes its own failure state — four blue lights blinking means the copy did not work — and the only one here with a switch to turn its lighting off.

    Bay count
    Two — stated in the title and in the first bullet, which describes two SATA drive interfaces alongside a Type-C socket, a USB-B socket and separate power and RGB buttons
    Supported drive sizes
    2.5-inch and 3.5-inch — stated in the title and in the third bullet
    Supported drive interfaces
    SATA hard discs and solid-state drives — stated in the third bullet. No SATA revision is named
    Solid-state slot support
    Not published on the listing — no M.2 position is named. Solid-state drives are supported in the two SATA bays and no separate slot exists
    Offline cloning
    Stated — the second bullet describes copying from one SATA drive to another with a switch and no software or tools, and adds three marked notes: use a larger destination, disconnect the PC during the copy, make sure the destination capacity is at least as large as the source, and read four blinking blue LEDs as a failed copy
    Interface standard
    USB 3.0 — stated in the fourth bullet as supporting extremely fast USB 3.0 data transfer
    Stated link rate
    Up to 5 Gbit/s — stated in the fourth bullet
    Connector type
    A Type-C socket and a USB-B socket on the dock, with a USB-B to USB-C cable and a USB-A adapter supplied — stated in the first and sixth bullets. It is the only dock on this shelf to publish both its sockets and its cable
    UASP support
    Not published on the listing — UASP is not named anywhere in the six bullets. Fourteen of the nineteen listings in this lot publish it, so the silence is worth noticing
    Power supply
    Not published on the listing — no adapter, no voltage and no current is named, on a dock stated to take two 3.5-inch drives
    Per-bay controls
    Separate power and RGB buttons are stated in the first bullet, with the RGB switch on the rear named again in the fifth. Neither is per-bay: no individual bay switch and no per-bay indicator is published
    Amazon reference
    B0GGR3P52T (same reference on 6 Amazon marketplaces)
    EAN
    0635393178823
    • Describes the failure signal, four blinking blue lights, which nothing else in this lot does
    • Publishes both its sockets and the cable and adapter supplied
    • Two capacity figures in one bullet, 16 TB each and 20 TB for a single drive

    Best for: A desk where drives are copied often and the operator wants to know from across the room whether it worked.

    ≈ $35 / £27 / 25 €
    Check price on Amazon
  • BENFEI black dual-bay drive docking station with a clone button and a power switch

    BENFEI dual-bay SATA dock, USB 3.0 at 5 Gbps, offline clone on a three-second press, 12 V/2.5 A supply

    The dock that publishes the two things most of this shelf leaves out — a 12 V/2.5 A supply rated for two spinning drives, and a power switch to protect them while they are fitted.

    Bay count
    Two — stated in the title and in the first bullet, which describes reading, writing and transferring in parallel between two 2.5-inch or 3.5-inch drives
    Supported drive sizes
    2.5-inch and 3.5-inch — stated in the title and in the first bullet
    Supported drive interfaces
    SATA hard discs and solid-state drives — stated in the title and in the first bullet. No SATA revision is named
    Solid-state slot support
    Not published on the listing — no M.2 position is named. Solid-state drives are supported in the two SATA bays and no separate slot exists
    Offline cloning
    Stated — the second bullet says the CLONE button is held for three seconds to transfer all data from the source drive to the destination without a computer, and notes that the destination must be equal to or larger than the source
    Interface standard
    Two designations are published: the title says USB 3.0 and the third bullet says USB 3.1 Gen 1. Both are printed and neither is withdrawn
    Stated link rate
    Up to 5 Gbit/s — stated in the title and in the third bullet
    Connector type
    Type-C — stated in the title as a USB-C docking station. No cable is named in any bullet
    UASP support
    Stated — the third bullet names UASP, the USB Attached SCSI Protocol, and claims it speeds transfers by up to 20 % against conventional USB 3.0. The same maker’s 2.5-inch enclosure on the enclosures shelf of this site puts the figure at 70 %
    Power supply
    A dedicated 12 V/2.5 A adapter — stated in the fourth bullet, which says it gives a stable supply to both bays and reliable operation even with two demanding 3.5-inch hard discs. It is the higher of the two current ratings published on this shelf
    Per-bay controls
    A single integrated power switch is stated in the fourth bullet, described as protecting the drives while they are connected and removed, with an instruction to switch the unit off before fitting or removing a drive. No per-bay switch and no per-bay indicator is published
    Amazon reference
    B0GTVMFGPT (same reference on 5 Amazon marketplaces)
    EAN
    6971785945371
    • Publishes the power supply with both figures, 12 V and 2.5 A
    • A power switch, with an instruction saying when to use it
    • USB 3.0 in the title and USB 3.1 Gen 1 in the bullets, with nothing reconciling them

    Best for: Two 3.5-inch mechanisms running at once, where the supply rating and the switch are the reasons to pay more than the cheaper docks here cost.

    ≈ 24 €
    Check price on Amazon
  • FIDECO black dual-bay drive docking station with two drive slots and a clone button

    FIDECO dual-bay SATA dock, USB 3.0 at 5 Gbps, offline clone on a five-second press, 2 × 12 TB

    The cheapest dock in this hub, and the one that tells you exactly how the copy is started: hold Clone for five seconds until the light blinks, with no computer attached.

    Bay count
    Two — stated in the third and fourth bullets, which describe two drives put into their respective slots and two drives supported at the same time
    Supported drive sizes
    2.5-inch and 3.5-inch — stated in the title and in the fourth and fifth bullets, which describe the flexibility of connecting two drives of either size to a computer
    Supported drive interfaces
    SATA I, II and III, hard discs and solid-state drives — stated in the fourth bullet, with the first adding that only SATA drives and SSDs are supported
    Solid-state slot support
    Not published on the listing — no M.2 position of any kind is named. Solid-state drives are supported in the two SATA bays and no separate slot exists
    Offline cloning
    Stated — the third bullet says two drives are put in their slots and the Clone button held for five seconds until the LED blinks, and that the copy is completed without a computer. It is the only listing on this shelf to publish both the duration of the press and the signal that confirms it
    Interface standard
    USB 3.0 — stated in the title and in the second bullet
    Stated link rate
    Up to 5 Gbps — stated in the second bullet as a very fast data transfer speed over USB 3.0
    Connector type
    Not published on the listing — no socket and no cable is named in any bullet
    UASP support
    Not published on the listing — UASP is not named anywhere. Fourteen of the nineteen listings in this lot publish it, so the silence here is worth noticing rather than assuming
    Power supply
    Not published on the listing — no adapter, no voltage and no current is named, on a dock that accepts two 3.5-inch drives at once and cannot run from a USB port
    Per-bay controls
    Not published on the listing — no power switch and no per-bay light is named. The third bullet describes a single LED that blinks when the clone starts
    Amazon reference
    B08291CB6J (same reference on 6 Amazon marketplaces)
    EAN
    0751450850409
    • Publishes the length of the button press and the signal that confirms it
    • Two bays at the lowest price in this hub
    • No power supply named at all, on a dock built for two 3.5-inch drives

    Best for: Reading a pile of old SATA drives one after another, on a desk where the copy button is the reason for buying rather than the transfer rate.

    ≈ $25 / £30 / 24 €
    Check price on Amazon

Others worth having spare

  • DIGITUS violet duplex OM4 fibre patch cables with LC connectors, five in a pack

    DIGITUS DK-2533-02-4, five 2 m duplex OM4 LC leads, 50/125 µ

    Five identical duplex OM4 leads in one box, sold with the most detailed rate-and-distance table on this shelf and an individual measurement report said to travel with every lead in the packet.

    Fibre type
    Multimode, fibre type 50/125 µ — stated in the title and in the first bullet, which calls it a multimode duplex
    Fibre grade
    OM4 — stated in the title and in the first bullet, which says the OM4 fibre offers higher transmission rates than OM1, OM2 and OM3, names compatibility with OM3, OM5 and short-wave division multiplexing, and gives wavelengths of 850 nm and 1300 nm
    Connector types at each end
    LC at both ends — stated in the title. The fourth bullet describes ceramic ferrules with dust caps, anti-kink boots and fibre marking
    Simplex or duplex
    Duplex — stated in the title, with five leads to a pack
    Polarity arrangement
    Not published on the listing — the fourth bullet names a fibre marking without saying what it marks or how it reads, and nothing anywhere says whether the pair is supplied crossed
    Length
    2 m — stated in the title, five pieces to a pack
    Jacket rating
    LSZH — stated in the third bullet, which says the outer sheath of the lead is made of halogen-free material and has flame-retardant behaviour in a fire
    Polish type
    UPC — named in the fourth bullet in brackets beside a return loss of 30 dB or better, with an insertion loss of 0.30 dB or less quoted in the same line
    Armouring
    Not published on the listing — no armour is named. The fifth bullet supplies an individual test or measurement report with every lead instead, and says all leads pass a strict quality control after production
    Amazon reference
    B0CXDX324B (same reference on 6 Amazon marketplaces)
    EAN
    4016032496212
    • Five rates each against its own distance and its own designation, the fullest such table here
    • Five leads to a pack, which populates a patch field rather than a single link
    • Polarity is unwritten, on five duplex leads at once

    Best for: Populating a patch field of OM4 links inside one cabinet, where five identical 2 m leads are exactly the order that is wanted.

    ≈ £25 / 24 €
    Check price on Amazon
  • Elfcam long simplex fibre patch cable with green LC/APC connectors at both ends

    Elfcam 30 m simplex OS2 LC/APC to LC/APC, 9/125 µm, 7.5 mm bend radius

    The longest lead in this hub by a wide margin, published with a bend radius and a bend-tolerant fibre conformity — and with two of its own descriptions at odds, on the jacket colour and on the jacket material.

    Fibre type
    Single-mode, 9/125 µm — stated in the title and in the first bullet, which describes the lead as running between a fibre termination point and an ONT
    Fibre grade
    OS2 — stated in the first and fourth bullets, with conformity to G.657.A2 and B2 named in the first and a minimum bend radius of 7.5 mm given immediately beside it
    Connector types at each end
    LC/APC at both ends — stated in the title and in the first bullet, and the fourth adds that every lead is supplied with dust caps
    Simplex or duplex
    Simplex — stated in the title and in the first bullet. One strand, one connector at each end
    Polarity arrangement
    Not published on the listing, and a simplex lead has no pair to cross
    Length
    30 m — stated in the title twice over. The fifth bullet gives the range the lead is sold in, from 0.5 m to 100 m
    Jacket rating
    LSZH — stated in the first bullet. The third then describes the outer sheath as a halogen-free, flame-retardant copolymer and names an inner sheath of PVC, which is the only mention of PVC on the page and sits awkwardly beside the LSZH claim
    Polish type
    APC — carried by the LC/APC designation at both ends. No angle, no insertion loss and no return loss figure is published; the fourth bullet says instead that leads are individually packed and supplied with a measurement report
    Armouring
    Not published on the listing — the third bullet names a filled loose tube and non-metallic strength members, which is a construction rather than an armour, and describes the lead as an indoor cable for laying inside buildings
    Amazon reference
    B091G2CN9D (same reference on 6 Amazon marketplaces)
    EAN
    0037603250037
    • Thirty metres, the longest lead on this shelf by a wide margin
    • A minimum bend radius is printed, which matters most on the longest run here
    • The jacket is white in the title and in the first bullet, and yellow in the fourth

    Best for: A long indoor run between a fibre termination point and a router at the other end of a flat, where 30 m of LC/APC is simply what the job needs.

    ≈ £24 / 25 €
    Check price on Amazon
  • FLYPROFiber aqua duplex OM4 fibre patch cable with LC connectors and A and B labelled clips

    FLYPROFiber 1 m duplex OM4 LC to LC, 50/125 µm, UPC polish, A/B labelled clips

    The only multimode lead here with a full reach table behind it — four rates, four distances, all at 850 nm — and the only one on this shelf whose duplex clip is marked A and B so a cabinet can be read at patching time.

    Fibre type
    Multimode, 50/125 µm — stated in the title and in the third bullet, which calls the fibre insensitive to bending, easy to strip and easy to splice
    Fibre grade
    OM4 — stated in the title and in the first bullet, with a bandwidth of 2000 MHz·km at 850 nm given in the second. The first bullet calls OM4 the preferred fibre specification for 40G and 100G applications
    Connector types at each end
    LC at both ends — stated in the title and in the first bullet, which names 40G BIDI SR, 10G SR, QSFP+ and SFP+ transceivers as what it is meant to join
    Simplex or duplex
    Duplex — stated in the title as 40 GB/100 GB Duplex and in the first bullet as an LC-LC duplex patch cable
    Polarity arrangement
    Embossed A and B position labels on the duplex clip and on the marking ring — stated in the fourth bullet, whose stated purpose is quick identification of Tx and Rx during installation, testing and fault finding. Whether the pair is supplied crossed is not published on the listing; the same bullet names adjustable connector clips, which is how a pair is rearranged by hand
    Length
    1 m — stated in the title, which also gives the range the lead is sold in, from 0.2 m to 100 m
    Jacket rating
    LSZH — stated in the title and in the fourth bullet, which calls the jacket an environmentally friendly LSZH sheath
    Polish type
    UPC — stated in the fourth bullet as a high-grade UPC polish on zirconia ceramic ferrules made in Japan. The third bullet quotes an insertion loss of 0.3 dB or less and a return loss of 30 dB or better
    Armouring
    Not published on the listing — no armour is named. The third bullet gives a minimum bend radius of 7.5 mm instead, and offers the lead for cabinets requiring twenty or more bends and for high-density installations in very small spaces
    Amazon reference
    B09C224CLK (same reference on 5 Amazon marketplaces)
    EAN
    0649910317572
    • Four ethernet distances at four rates, all quoted at 850 nm, the fullest reach table on this shelf
    • A and B labels embossed on the clip and the marking ring, so Tx and Rx can be read by eye
    • The four distances belong to the fibre, and the lead in the bag is 1 m long

    Best for: A short OM4 hop between two SFP+ cages in the same cabinet, where the A and B labels earn their keep every time the patching changes.

    ≈ 8 €
    Check price on Amazon

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