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Western Digital SN740 256 GB

256 GB
Capacity
WD 20-82-10081
Controller
TLC
Flash
PCIe 4.0 x4
Interface
M.2 2230
Form Factor
SSD Controller
Controller
The Western Digital SN740 is a solid-state drive in the M.2 2230 form factor, launched on May 9th, 2022. It is available in capacities ranging from 256 GB to 2 TB. This page reports specifications for the 256 GB variant. With the rest of the system, the Western Digital SN740 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the 20-82-10081-A1 Polaris MP16+ from WD, a DRAM cache is not available. Western Digital has installed 112-layer TLC NAND flash on the SN740, the flash chips are made by Kioxia. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The SN740 is rated for sequential read speeds of up to 4,000 MB/s and 2,000 MB/s write; random IO reaches 270K IOPS for read and 470K for writes.
The SSD's price at launch is unknown. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 200 TBW, a typical value for consumer SSDs.

Solid-State-Drive

Capacity: 256 GB
Variants: 256 GB 512 GB 1 TB 2 TB
Overprovisioning: 17.6 GB / 7.4 %
Production: Active
Released: May 9th, 2022
Part Number: SDDQTQD-256G
Market: Consumer

Physical

Form Factor: M.2 2230
Interface: PCIe 4.0 x4
Protocol: NVMe 1.4
Power Draw: 0.05 W (Idle)
Unknown (Avg)
4.7 W (Max)

Controller

Manufacturer: WD
Name: 20-82-10081-A1 Polaris MP16+
Architecture: ARM 32-bit Cortex-R
Foundry: TSMC FinFET
Process: 16 nm
Flash Channels: 4 @ 1,600 MT/s
Chip Enables: 4
Controller Features: HMB (enabled)

NAND Flash

Manufacturer: Kioxia
Name: BiCS5
Type: TLC
Technology: 112-layer
Speed: 1200 MT/s
Capacity: 1 chip @ 2 Tbit
Toggle: 4.0
Topology: Charge Trap
Dies per Chip: 4 dies @ 512 Gbit
Planes per Die: 2
Word Lines: 128 per NAND String
87.5% Vertical Efficiency
Read Time (tR): 56 µs
Program Time (tProg): 484 µs
Die Read Speed: 571 MB/s
Die Write Speed: 66 MB/s
Endurance:
(up to)
3000 P/E Cycles
(100000 in SLC Mode)
Page Size: 16 KB
Block Size: 1344 Pages
Plane Size: 448 Blocks

DRAM Cache

Type: None
Host-Memory-Buffer (HMB): 64 MB

Performance

Sequential Read: 4,000 MB/s
Sequential Write: 2,000 MB/s
Random Read: 270,000 IOPS
Random Write: 470,000 IOPS
Endurance: 200 TBW
Warranty: 5 Years
MTBF: 1.8 Million Hours
Drive Writes Per Day (DWPD): 0.4
SLC Write Cache: Yes

Features

TRIM: Yes
SMART: Yes
Power Loss Protection: No
Encryption:
  • TCG Opal
  • TCG Pyrite
RGB Lighting: No
PS5 Compatible: Yes

Notes

Drive:

SDDPTQD-256G doesn't offer Security Encription
SDDQTQD-256G offer Security Encription
MTBF: 1.75 Millions of Hours

NAND Die:

Although this Die is a 4-plane design, most Kioxia BiCS5 NAND Dies used in most SSDs are dual planes design because of Yield and production cost.
And because of the die being dual-plane the Throughput is cut in half to 66 MB/s per die.
There is no CuA (Circuitry under Array) in the Dual-Plane variant.
Typical Endurance: 1700 P.E.C.
Rated Endurance: 3.000 to 5.000 (up to) P.E.C.
Typ. Endurance eTLC: ~ 6.000 P.E.C.

Oct 5th, 2024 02:47 EDT change timezone

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