Seagate Momentus (ST9500325AS) 500GB, 5400RPM, 2.5" Internal Hard Drive - Anand International Inc.

Seagate

Seagate Momentus 5400.6 ST9500325AS – 500GB SATA 3Gb/s | 2.5" 9.5mm | 5,400 RPM | 8MB Cache | Notebook HDD

Name: Seagate Momentus 5400.6 ST9500325AS – 500GB SATA 3Gb/s | 2.5" 9.5mm | 5,400 RPM | 8MB Cache | Notebook HDD
Brand: Seagate
SKU: ST9500325AS
Price: 57.50 USD
Availability: InStock

$57.50

Tax included.

Product variants

Quantity

Brand New, Factory Sealed | In Stock | Bulk Orders Available

The Seagate Momentus 5400.6 ST9500325AS is a 500GB SATA 3Gb/s 2.5" 9.5mm notebook hard drive spinning at 5,400 RPM with an 8MB cache buffer. The flagship capacity of the Momentus 5400.6 family, the ST9500325AS uses 2 discs and 4 heads with fourth-generation perpendicular magnetic recording technology, delivering a 14ms average seek time, 5.56ms average latency, and a maximum interface speed of 300 MB/s. Idle power is just 1.2W. Non-operating shock tolerance is 1,000G and operating shock is 350G. The drive includes Seagate's 3D Defense System, S.M.A.R.T. monitoring, Native Command Queuing (NCQ), QuietStep ramp load acoustics, and SmartAlign technology for transparent 4K sector transitions.

At 9.5mm height and 98.8g, the ST9500325AS fits any standard 2.5" notebook bay. It is designed for mainstream and high-performance laptops, external storage solutions, and industrial applications requiring a small form factor.

Key Specs at a Glance:

Capacity: 500GB
Interface: SATA 3Gb/s (Serial-ATA/300)
Speed: 5,400 RPM
Cache: 8MB
Discs: 2 | Heads: 4
Recording: Perpendicular Magnetic Recording (4th generation)
Average Seek Time: 14ms
Average Latency: 5.56ms
Max Interface Speed: 300 MB/s
Idle Power: 1.2W | Seek: 2.4W | Standby: 0.36W
Acoustics: 2.3 Bel idle
Operating Shock: 350G | Non-operating: 1,000G
Dimensions: 69.85mm W × 100.5mm D × 9.5mm H
Weight: 98.8g
Guaranteed Sectors: 976,773,168

Specifications

Manufacturer: Seagate

Series: Momentus 5400.6
Model: ST9500325AS
Note: ST9500325ASG = Free Fall Protection variant | ST9500420AS = Momentus 7200.4 (7,200 RPM, same 500GB)
Formatted Capacity: 500GB
Guaranteed Sectors: 976,773,168
Bytes Per Sector: 512
Interface: SATA 3Gb/s (Serial-ATA/300)
Spindle Speed: 5,400 RPM
Cache: 8MB
Discs: 2
Heads: 4
Recording: Perpendicular Magnetic Recording (4th generation)
Average Seek Time: 14ms
Average Latency: 5.56ms
Max Interface Speed: 300 MB/s
Idle Power: 1.2W
Seek Power: 2.4W
Standby Power: 0.36W
Spinup Current: 1,200mA
Acoustics (Idle): 2.3 Bel
Acoustics (Min seek): 2.5 Bel
Acoustics (Max seek): 3.0 Bel
Operating Shock: 350G
Non-operating Shock: 1,000G
Supply Voltage: 5V
Width: 69.85mm (2.75")
Depth: 100.5mm (3.96")
Height: 9.5mm (0.37")
Weight: 98.8g (0.22 lbs)
Warranty: 2-year limited
Drive Type: Internal 2.5" SATA Notebook HDD

Product Features

Brand new, factory sealed 2.5" 9.5mm SATA 3Gb/s 5,400 RPM notebook hard drive

500GB formatted capacity
Interface: SATA 3Gb/s (Serial-ATA/300)
Speed: 5,400 RPM
Cache: 8MB
Discs: 2 | Heads: 4
Recording: Perpendicular Magnetic Recording (4th generation)
Guaranteed Sectors: 976,773,168
Bytes Per Sector: 512
Average Seek Time: 14ms
Average Latency: 5.56ms
Max Interface Speed: 300 MB/s
Idle Power: 1.2W | Seek: 2.4W | Standby: 0.36W
Spinup Current: 1,200mA
Acoustics: 2.3 Bel idle / 2.5 Bel min seek / 3.0 Bel max seek
Operating Shock: 350G | Non-operating: 1,000G
Native Command Queuing (NCQ)
QuietStep ramp load technology
SmartAlign 4K sector technology
G-Force Protection (standard on ASG variant)
Fluid Dynamic Bearing (FDB) motor
3D Defense System (Drive Defense, Data Defense, Diagnostic Defense)
S.M.A.R.T. monitoring
SeaTools Drive Self-Test (DST)
Programmable power management
2-year limited warranty
Form Factor: 2.5" | 9.5mm height
Dimensions: 69.85mm W × 100.5mm D × 9.5mm H
Weight: 98.8g (0.22 lbs)

Compatibility

Compatible with any system accepting a 2.5" 9.5mm SATA drive. Supports SATA 3Gb/s with Native Command Queuing. The ST9500325AS is the standard variant. The ST9500325ASG is the Free Fall Protection variant with the same specs plus an integrated 0G sensor that parks heads before a drop impact. SmartAlign technology enables transparent operation on systems with 4K-sector-aware OSes without requiring additional software utilities.

Shipping & Returns

Free Shipping: We currently offer free Economy Shipping within the continental U.S. with no minimum order required. Expedited shipping is available at standard carrier rates.
Same-Day Shipping: Order placed before 2PM PST will ship the same day. Orders received after this time will ship the following business day.
Hassle-Free Returns: If you're not completely satisfied with your purchase, simply return it within 10 days for a hassle-free refund or exchange.

500GB SATA 3Gb/s Momentus 5400.6 5,400 RPM 14ms Seek 8MB Cache 1.2W Idle 1,000G Non-Op Shock NCQ Factory Sealed

Seagate's 500GB flagship Momentus 5400.6 notebook drive — fourth-generation PMR, 1.2W idle power, 1,000G non-operating shock, QuietStep acoustics, and SmartAlign 4K sector technology in a 2.5" 9.5mm SATA 3Gb/s platform

The ST9500325AS is the 500GB flagship of Seagate's Momentus 5400.6 series — a 5,400 RPM 2.5" SATA family using fourth-generation perpendicular magnetic recording to deliver up to 500GB in the standard 9.5mm notebook form factor. The series was positioned as the lowest-power 5,400 RPM laptop hard drive of its generation, with idle consumption of just 1.2W achieved through ramp load head parking, programmable power management, and an FDB motor. SmartAlign provides seamless 4K Advanced Format sector compatibility without software utilities. The ST9500325ASG variant adds Free Fall Protection via an integrated 0G sensor. The Momentus 5400.6 was designed for mainstream laptops, high-performance notebooks, external storage, and industrial small-form-factor applications.

500GB Dual-Platter — Fourth-Generation PMR, NCQ, SATA 3Gb/s

The ST9500325AS stores 500GB across 2 discs and 4 heads using Seagate's fourth-generation perpendicular magnetic recording technology. The SATA 3Gb/s interface with Native Command Queuing delivers burst transfer rates up to 300 MB/s and optimizes I/O command ordering for improved multitasking performance in notebook and portable storage environments.

1.2W Idle Power — QuietStep Ramp Load, FDB Motor, 2.3 Bel Acoustics

Idle power of just 1.2W — combined with QuietStep technology for ultra-quiet ramp load/unload acoustics and a Fluid Dynamic Bearing motor — makes the ST9500325AS one of the lowest-power 5,400 RPM laptop drives of its generation. Idle acoustics measure just 2.3 Bel. Ramp load parks the heads off the disc surface during idle periods, reducing both idle power and mechanical wear.

1,000G Non-Operating Shock — G-Force Protection, 3D Defense System, SmartAlign

The ST9500325AS tolerates 350G operating shock and 1,000G non-operating shock — robust protection for the rigors of mobile use. Optional G-Force Protection (standard on the ASG variant) detects free-fall events and parks heads before impact. Seagate's 3D Defense System covers Drive Defense, Data Defense, and Diagnostic Defense. SmartAlign enables transparent 4K sector operation without OS-level utilities.

Brand New, Factory Sealed — Momentus 5400.6 500GB | Alt P/N family: 9HH134-xxx

Available as brand new factory sealed units. The ST9500325AS is the standard variant of the Momentus 5400.6 500GB. The ST9500325ASG is the Free Fall Protection variant — same specs, adds integrated 0G sensor. Not to be confused with the ST9500420AS (Momentus 7200.4 — same 500GB capacity, 7,200 RPM) or ST9500423AS (Momentus 7200.5).

Frequently Asked Questions

Frequently asked questions for SATA, including information on usage, configuration, and compatibility.

1. What is a SATA hard drive used for?

A SATA (Serial ATA) hard drive is used in desktops, laptops, servers, and NAS systems for data storage. It’s the most common hard drive type, offering a balance of speed, affordability, and wide compatibility.

2. What’s the difference between SATA I, II, and III?

The difference is speed. SATA I supports up to 1.5 Gb/s (150 MB/s), SATA II up to 3 Gb/s (300 MB/s), and SATA III up to 6 Gb/s (600 MB/s). Most modern drives use SATA III but remain backward compatible with older versions.

3. Are SATA hard drives compatible with older systems?

Yes. SATA drives are backward compatible, meaning a SATA III drive can work on a SATA II or I port, though performance will be limited to the slower speed of the system.

4. What’s the maximum capacity of a SATA hard drive?

SATA hard drives come in a wide range of capacities, from 500GB to over 20TB. This makes them suitable for everything from basic desktop use to large-scale data storage and backup.

5. Can I use a SATA hard drive in RAID or NAS systems?

Yes. SATA drives support RAID configurations and can be used in NAS systems. For higher reliability, enterprise-grade SATA models such as NAS, surveillance, or data-center drives are recommended.

6. What is the difference between a 2.5" and a 3.5" SATA hard drive?

2.5" SATA drives are smaller and commonly used in laptops or compact systems, while 3.5" SATA drives are larger and primarily used in desktops, servers, and NAS devices.

7. How do SATA hard drives compare to SSDs?

Both use the SATA interface, but HDDs store data on spinning disks while SSDs use flash memory. SSDs are much faster, but SATA HDDs remain more affordable for high-capacity storage.