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Seagate IronWolf Pro 125 3.8 TB

3.8 TB
Capacity
Phison S12
Controller
TLC
Flash
SATA 6 Gbps
Interface
2.5"
Form Factor
Front
Back
Back
SSD Controller
Controller
NAND Die
NAND Die
The Seagate IronWolf Pro 125 is a solid-state drive in the 2.5" form factor, launched in 2018. It is available in capacities ranging from 240 GB to 3.8 TB. This page reports specifications for the 3.8 TB variant. With the rest of the system, the Seagate IronWolf Pro 125 interfaces using a SATA 6 Gbps connection. The SSD controller is the PS3112-S12-27 from Phison. Seagate has installed 96-layer TLC NAND flash on the IronWolf Pro 125, 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. The IronWolf Pro 125 is rated for sequential read speeds of up to 545 MB/s and 520 MB/s write; random IO reaches 96K IOPS for read and 30K for writes.
At its launch, the SSD was priced at 954 USD. The warranty length is set to five years, which is an excellent warranty period. Seagate guarantees an endurance rating of 7000 TBW, a good value.

Solid-State-Drive

Capacity: 3.8 TB (3840 GB)
Variants: 240 GB 480 GB 960 GB 1.9 TB 3.8 TB
Overprovisioning: 519.7 GB / 14.5 %
Production: Active
Released: 2018
Price at Launch: 954 USD
Part Number: ZA3840NX10001
Market: Consumer

Physical

Form Factor: 2.5"
Interface: SATA 6 Gbps
Protocol: AHCI
Power Draw: 1.9 W (Idle)
Unknown (Avg)
5.0 W (Max)

Controller

Manufacturer: Phison
Name: PS3112-S12-27
Architecture: ARM 32-bit
Core Count: Quad-Core
Frequency: 666 MHz
Foundry: TSMC
Process: 28 nm
Flash Channels: 8 @ 667 MT/s
Chip Enables: 4
Controller Features: DRAM

NAND Flash

Manufacturer: Toshiba
Name: BiCS4
Type: TLC
Technology: 96-layer
Speed: 800 MT/s
Capacity: 16 chips @ 2 Tbit
ONFI: 4.0
Toggle: 3.0
Topology: Charge Trap
Process: 19 nm
Die Size: 86 mm²
(6.0 Gbit/mm²)
Dies per Chip: 4 dies @ 512 Gbit
Planes per Die: 2
Decks per Die: 2
Word Lines: 109 per NAND String
88.1% Vertical Efficiency
Read Time (tR): 58 µs
Program Time (tProg): 561 µs
Die Read Speed: 551 MB/s
Die Write Speed: 57 MB/s
Endurance:
(up to)		 3000 P/E Cycles
(30000 in SLC Mode)
Page Size: 16 KB
Block Size: 1152 Pages
Plane Size: 1822 Blocks

DRAM Cache

Type: Unknown
Capacity: 4096 MB
Organization: x8
Host-Memory-Buffer (HMB): N/A

Performance

Sequential Read: 545 MB/s
Sequential Write: 520 MB/s
Random Read: 96,000 IOPS
Random Write: 30,000 IOPS
Endurance: 7000 TBW
Warranty: 5 Years
MTBF: 1.8 Million Hours
Drive Writes Per Day (DWPD): 1.0
SLC Write Cache: Yes

Features

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

Notes

Drive:

Although Seagate has re-branded the controller as "STXXA0123185" it is manufactured by Phison and it is the model S12.

Controller:

2 main cores using Cortex-R5 clocked at 666 MHz with CoXProcessor technology (one additional dual-core) Cortex-R5 clocked at a lower clock for better efficience.

NAND Die:

Read latency tR: 58 µs (ABL)
tPROG with ~ 25% Overhead: ~ 750 µs (Avg - 42.7 MB/s per each die)
Jun 1st, 2024 15:41 EDT change timezone

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