Uniqcli

Best U.2 and U.3 Enterprise SSDs for Servers

2.5-inch hot-swap enterprise NVMe drives in U.2 and U.3 form factors — read by endurance class, capacity, PCIe generation and whether the server backplane is tri-mode U.3 or U.2-only.

U.2 and U.3 enterprise SSDs in stock at Uniqcli

How to choose →

A curated selection with live pricing — in-stock lines first, then back-ordered lines with a typical lead time. Every line is sourced through US distribution and screened for NDAA §889 status before checkout, with TAA verified on request.

Entry U.2, Samsung

Samsung

Samsung Enterprise 983 DCT 960 GB Solid State Drive

MZQLB960HAJR

A Samsung 983 DCT 960 GB U.2 data-center NVMe drive — the entry into the enterprise form factor for a boot pair or a read-mostly tier, with power-loss protection and a data-center endurance rating.

$850.48Back-ordered
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Lenovo 7450 PRO U.3

Lenovo

Lenovo 7450 PRO 960 GB Solid State Drive

4XB7A13975

A Lenovo 7450 PRO 960 GB U.3 read-intensive NVMe drive on PCIe Gen4 — an OEM-qualified U.3 tri-mode part for a ThinkSystem server, sized for content, boot and analytics-read workloads.

$961.07Back-ordered
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Micron 7450 PRO U.3

Micron Technology

Micron 7450 PRO 960 GB Solid State Drive

MTFDKCB960TFR-1BC1ZABYY

A Micron 7450 PRO 960 GB U.3 read-intensive NVMe drive on PCIe Gen4 — the mainstream read-intensive workhorse of Micron's enterprise line, for the bulk of a virtualization or content estate.

$1,092.00Back-ordered
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Samsung PM9A3 U.2

Samsung

Samsung PM9A3 960 GB Solid State Drive

MZQL2960HCJR-00BAL

A Samsung PM9A3 960 GB U.2 NVMe drive on PCIe Gen4 — a widely qualified data-center part for a read-intensive server tier, with the endurance and power-loss protection of Samsung's enterprise line.

$1,647.00Back-ordered
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Lenovo PM1743 U.3

Lenovo

Lenovo ThinkSystem PM1743 1.92 TB Solid State Drive

4XB7A84129

A Lenovo ThinkSystem PM1743 1.92 TB U.3 NVMe drive on PCIe Gen5 — the next-generation throughput tier for a ThinkSystem platform whose lanes are Gen5, in the tri-mode U.3 form factor.

$1,231.20Back-ordered
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Lenovo 7400 PRO U.3

Lenovo

Lenovo 7400 PRO 1.92 TB Solid State Drive

4XB7A80377

A Lenovo 7400 PRO 1.92 TB U.3 read-intensive NVMe drive on PCIe Gen4 — a nearly-two-terabyte read tier for a ThinkSystem server, OEM-qualified against the platform's tri-mode backplane.

$1,348.32Back-ordered
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Lenovo P5520 U.2

Lenovo

Lenovo P5520 3.84 TB Solid State Drive

4XB7A17124

A Lenovo P5520 3.84 TB U.2 read-intensive NVMe drive on PCIe Gen4 — a high-capacity read tier in the U.2 form factor, sized to collapse a rack of read-mostly storage into a handful of bays.

$1,770.77Back-ordered
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Kingston Gen5 U.2

Kingston Technology

Kingston DC3000ME 3.84 TB Solid State Drive

SEDC3000ME/3T8

A Kingston DC3000ME 3.84 TB U.2 mixed-use NVMe drive on PCIe Gen5 — a write-endurant, next-generation drive for a database or cache tier on a host whose lanes are Gen5.

$3,400.80Back-ordered
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Samsung PM1733 U.2

Samsung

Samsung PM1733 1.92 TB Solid State Drive

MZ-WLJ1T90

A Samsung PM1733 1.92 TB U.2 NVMe drive on PCIe Gen4 — a high-throughput data-center part for a demanding read or mixed tier, with Samsung's enterprise power-loss protection and endurance rating.

$3,475.77In stock
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Micron mixed-use TAA

Micron Technology

Micron 3.20 TB Solid State Drive

MTFDKCC3T2TFS-1BC1ZABYY

A Micron 3.2 TB U.3 mixed-use NVMe drive on PCIe Gen4 — the higher write-endurance class for a database or write-heavy log, ordered as the manufacturer's TAA-marked part number.

Its title reads TAA Compliant. TAA and standard variants are different SKUs, so we screen and document the exact part number on the quote rather than the model family.

$3,866.03Back-ordered
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Micron 9200 PRO U.2

Micron Technology

Micron 9200 9200 PRO 3.84 TB Solid State Drive

MTFDHAL3T8TCT-1AR1ZABYY

A Micron 9200 PRO 3.84 TB U.2 NVMe drive over the SFF-8639 connector — a high-capacity enterprise part for a read-mostly tier on a server whose backplane presents U.2 rather than U.3.

$4,903.33Back-ordered
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Axiom EP750 U.2

Axiom Memory Solutions

3.84TB U.2 PCIe Gen4 x4 Enterprise Pro EP750 SSD

SSDUX10HN3T8-AX

An Axiom Enterprise Pro EP750 3.84 TB U.2 hot-swap NVMe drive on PCIe Gen4 — a high-capacity enterprise drive in the U.2 form factor for a server tier that needs the density without the OEM part premium.

$5,269.15In stock
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Micron 7450 PRO 7.68TB

Micron Technology

Micron PRO 7450 PRO 7.68 TB Solid State Drive

MTFDKCC7T6TFR-1BC1ZABYYR

A Micron 7450 PRO 7.68 TB U.3 read-intensive NVMe drive on PCIe Gen4 — a high-density read tier that puts most of a storage shelf into a single hot-swap bay.

$19,731.99Back-ordered
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WD Gold U.2 7.68TB

Western Digital

Western Digital Gold WDS768T1D0D 7.68 TB Solid State Drive

WDS768T1D0D

A Western Digital Gold 7.68 TB U.2 NVMe drive over the SFF-8639 connector — a high-capacity enterprise drive for a read or archive tier on a U.2 backplane, from WD's data-center line.

$8,449.79Back-ordered
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Kingston 15.36TB U.2

Kingston Technology

Kingston DC3000ME 15.36 TB Solid State Drive

SEDC3000ME/15T3

A Kingston DC3000ME 15.36 TB U.2 mixed-use NVMe drive on PCIe Gen5 — a top-of-density, write-endurant part for a capacity-and-write tier where one bay replaces a shelf of disks.

$10,136.00In stock
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More enterprise SSDs in the Uniqcli catalog

See all 9,672 enterprise SSDs

More from across this category. In-stock lines lead, and a back-ordered line carries the same estimated availability its product page does — with live pricing throughout, NDAA §889 screening before checkout and TAA verified on request.

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Or send it through the quote desk

U.2 and U.3 are the enterprise NVMe form factors that put a hot-swappable 2.5-inch drive on the front of a server, and the difference between them is the backplane, not the drive bay. U.2 carries PCIe over the SFF-8639 connector; U.3 uses the newer SFF-TA-1001 wiring so a single tri-mode backplane slot can take a U.3 NVMe drive, a SAS drive or a SATA drive interchangeably. A U.3 drive is generally backward-compatible with a U.2 host, but a U.2 drive does not run in a U.3-only tri-mode slot, so the first question is what the server's backplane actually presents. Everything on this page is a U.2 or U.3 enterprise SSD — a data-center part with power-loss protection, an endurance rating and a service life measured in drive writes per day, not a client drive in a caddy.

After the form factor, three numbers pick the drive. Endurance class is first: read-intensive drives are built for the bulk of enterprise workloads — content, boot, analytics reads, and the large majority of a virtualization estate — while mixed-use drives carry the higher write endurance a database, a cache tier or a write-heavy log deserves, and they cost more per gigabyte for it. Capacity is second, and NVMe now runs from under a terabyte to tens of terabytes on a single drive, so a rack's worth of storage can collapse into a handful of bays. PCIe generation is third: Gen4 is the mainstream today and Gen5 drives are landing, but the drive only delivers its rated throughput if the server's lanes match, so read the host's PCIe generation before paying for the drive's. Where a purchase order names TAA, read it on the exact part number — TAA-marked variants exist under separate SKUs and the paperwork follows the one that ships.

Buyer's checklist

How to choose a U.2 or U.3 enterprise SSD

  • Check the server backplane first: a U.3 tri-mode slot takes U.3 NVMe, SAS or SATA, but a U.2 drive does not run in a U.3-only slot — confirm what the host presents before ordering the form factor.
  • Pick the endurance class by workload: read-intensive for content, boot, analytics reads and most of a virtualization estate; mixed-use for databases, cache tiers and write-heavy logs that earn the higher drive-writes-per-day rating.
  • Size capacity against the bay count, not the byte count: a single NVMe drive now runs from under a terabyte to tens of terabytes, so a few bays can replace a rack of spinning storage.
  • Match the PCIe generation to the host — Gen4 is mainstream and Gen5 is arriving — because a drive only delivers its rated throughput if the server's lanes are the same generation.
  • Confirm power-loss protection and the data-center feature set are present; these are enterprise drives with capacitor-backed write protection, not client SSDs in a hot-swap caddy.
  • Where the order names TAA, read it on the part number — TAA-marked variants exist under separate SKUs, and it is a per-part fact to verify on the exact drive you order.

U.2 versus U.3, and why the backplane decides

The two form factors share the 2.5-inch drive body and the hot-swap bay, which is what makes them look interchangeable until a drive will not train. U.2 wires PCIe through the SFF-8639 connector and has been the enterprise NVMe standard for years. U.3 rewires the same physical connector to the SFF-TA-1001 specification so one tri-mode backplane slot can accept a U.3 NVMe drive, a SAS drive or a SATA drive, which is why servers increasingly ship U.3 backplanes: one slot type, three protocols, and a simpler bill of materials. The compatibility rule that matters at ordering time is directional — a U.3 drive generally runs in a U.2 host, but a U.2 drive does not run in a U.3-only slot, and a tri-mode backplane also needs the host firmware and the storage controller to agree. Read the server's own documentation for which form factor the bays present and whether the drives on this page are on its supported list, especially for the OEM-branded drives that are qualified against a specific platform.

Endurance, capacity and the total configuration

The endurance class is the specification that most often gets bought wrong, in both directions. Paying for mixed-use write endurance on a read-mostly content or boot workload wastes budget on drive-writes-per-day nobody will use; putting a read-intensive drive under a write-heavy database or a cache tier wears it out early and turns a capacity decision into a replacement schedule. Match the class to the measured write pattern, not to a habit or a spare-parts list. Capacity then decides how many bays the design needs — modern NVMe densities let a handful of drives carry what used to be a shelf of disks, which changes the power, the cooling and the rebuild-time maths as much as the rack space. A storage refresh is rarely just the drives, so Uniqcli quotes the U.2 or U.3 SSDs alongside the server or JBOF they populate, the tri-mode backplane or controller if the platform needs one, the rails and cabling, and the support and migration services, on one order with the country-of-origin and Section 889 screening tied to each part number.

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FAQ

Common questions

What is the difference between U.2 and U.3 SSDs?
Both are 2.5-inch hot-swap enterprise NVMe drives, and they share the same physical connector body. U.2 wires PCIe through the SFF-8639 pinout; U.3 uses the newer SFF-TA-1001 wiring so a single tri-mode backplane slot can take a U.3 NVMe drive, a SAS drive or a SATA drive interchangeably. The rule that matters when you order is directional: a U.3 drive generally runs in a U.2 host, but a U.2 drive does not run in a U.3-only tri-mode slot. So the first thing to confirm is what the server's backplane presents, and whether the drive is on that platform's supported list — particularly for OEM-branded drives qualified against a specific server.
Do I need read-intensive or mixed-use endurance?
Match it to the write pattern. Read-intensive drives are built for the bulk of enterprise workloads — content, boot, analytics reads and most of a virtualization estate — and cost less per gigabyte. Mixed-use drives carry a higher drive-writes-per-day endurance rating for databases, cache tiers and write-heavy logs, and cost more for it. Paying for mixed-use endurance on a read-mostly workload wastes budget; putting a read-intensive drive under heavy writes wears it out early. Size the class against the measured write rate rather than the nameplate, and where you cannot characterise the workload, mixed-use is the safer specification for anything that writes constantly.
Can business, government and education buyers order these?
Every line Uniqcli quotes is sourced through US distribution and screened for TAA country-of-origin and NDAA §889 status before checkout — with documentation tied to the specific part number, not a product family.
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