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Western Digital SN770M 1 TB

1 TB
Capacity
WD 20-82-10081
Controller
TLC
Flash
PCIe 4.0 x4
Interface
M.2 2230
Form Factor
Front
SSD Controller
Controller
The Western Digital SN770M is a solid-state drive in the M.2 2230 form factor, launched in September 2023. It is available in capacities ranging from 500 GB to 2 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the Western Digital SN770M 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 SN770M, the flash chips are made by Toshiba. 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 SN770M is rated for sequential read speeds of up to 5,000 MB/s and 4,900 MB/s write; random IO reaches 740K IOPS for read and 800K 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 600 TBW, a typical value for consumer SSDs.

Solid-State-Drive

Capacity: 1 TB (1000 GB)
Variants: 500 GB 1 TB 2 TB
Overprovisioning: 92.7 GB / 10.0 %
Production: Active
Released: Sep 2023
Part Number: WDBDNH0010BBK-WRSN
Market: Consumer

Physical

Form Factor: M.2 2230 (Single-Sided)
Interface: PCIe 4.0 x4
Protocol: NVMe 1.4
Power Draw: Unknown

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: Toshiba
Name: BiCS5
Type: TLC
Technology: 112-layer
Speed: 1200 MT/s
Capacity: 1 chip @ Unknown
Toggle: 4.0
Topology: Charge Trap
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: 5,000 MB/s
Sequential Write: 4,900 MB/s
Random Read: 740,000 IOPS
Random Write: 800,000 IOPS
Endurance: 600 TBW
Warranty: 5 Years
MTBF: 1.8 Million Hours
Drive Writes Per Day (DWPD): 0.3
SLC Write Cache: Yes

Features

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

Same Drive

This section lists other SSDs in our database using the exact same hardware components

Notes

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.
Jun 2nd, 2024 04:10 EDT change timezone

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