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Seagate IronWolf 125 250 GB

250 GB
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 125 is a solid-state drive in the 2.5" form factor, launched in 2019. It is available in capacities ranging from 250 GB to 4 TB. This page reports specifications for the 250 GB variant. With the rest of the system, the Seagate IronWolf 125 interfaces using a SATA 6 Gbps connection. The SSD controller is the PS3112-S12-27 from Phison, a DRAM cache chip is available. Seagate has installed 96-layer TLC NAND flash on the IronWolf 125, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are handled more quickly. The IronWolf 125 is rated for sequential read speeds of up to 560 MB/s and 540 MB/s write; random IO reaches 95K IOPS for read and 90K for writes.
The SSD's price at launch is unknown. The warranty length is set to five years, which is an excellent warranty period. Seagate guarantees an endurance rating of 300 TBW, a good value.

Solid-State-Drive

Capacity: 250 GB
Variants: 250 GB 500 GB 1 TB 2 TB 4 TB
Overprovisioning: 23.2 GB / 10.0 %
Production: Active
Released: 2019
Part Number: ZA250NM10002
Market: Consumer

Physical

Form Factor: 2.5"
Interface: SATA 6 Gbps
Protocol: AHCI
Power Draw: 0.11 W (Idle)
Unknown (Avg)
2.3 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 (enabled)

NAND Flash

Manufacturer: Toshiba
Name: BiCS4
Type: TLC
Technology: 96-layer
Speed: 800 MT/s
Capacity: Unknown
ONFI: 4.0
Toggle: 3.0
Topology: Charge Trap
Process: 19 nm
Die Size: 86 mm²
(6.0 Gbit/mm²)
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: DDR3-1866
Capacity: Unknown
Organization: x16

Performance

Sequential Read: 560 MB/s
Sequential Write: 540 MB/s
Random Read: 95,000 IOPS
Random Write: 90,000 IOPS
Endurance: 300 TBW
Warranty: 5 Years
MTBF: 1.8 Million Hours
Drive Writes Per Day (DWPD): 0.7
SLC Write Cache: Yes

Features

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

Notes

Drive:

Although Seagate has re-branded the controller as "STXZA01F5578" 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 14:08 EDT change timezone

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