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Silver 3.5 inch bare hard drive with exposed circuit board

Seagate

Seagate ST3120026AS 120GB 7200 RPM 8MB SATA 1.5Gb/s 3.5" internal hard drive

SKU CH-0Z8J-3QJB5 MPN ST3120026AS

A 120 GB desktop hard drive spinning at 7200 RPM with 8 MB cache on a SATA 1.5Gb/s interface

  • Total capacity120 GB
  • Interface typeSATA 1.5Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory8 MB
  • 7200 RPM spindle speed accelerates data access
  • 8 MB cache buffer smooths burst transfers
  • SATA 1.5Gb/s interface connects to desktop motherboards
  • 120 GB capacity stores operating system and applications
  • 350 Gs non‑operating shock rating protects stored data

Capacity and use-case

This 120 GB desktop hard drive suits basic storage needs such as legacy operating systems, small application sets or secondary data volumes. Its 7200 RPM spindle and 8 MB cache deliver standard mechanical performance for everyday tasks. The SATA 1.5 Gb/s interface matches older motherboards and controllers that do not support faster SATA revisions. Buyers who need more capacity or modern transfer speeds should consider other options.

Build and connectors

The bare 3.5 inch drive measures 1.0 inch high and uses the 350 Gs non-operating shock rating together with a 3D Defense System for physical resilience. A standard SATA data and power connector pair provides simple installation in any compatible bay or caddy. The 8.5 ms average seek time and 4.16 ms latency reflect typical mechanical behaviour for this class of drive.

Compatibility check

Verify that the host system provides a free SATA port operating at 1.5 Gb/s and a 3.5 inch drive bay with the correct mounting holes. Ensure the power supply includes a SATA power lead or an adapter for the drive’s connector. Confirm the BIOS or operating system can recognise a 120 GB volume without additional drivers or updates.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $71.99
Cheaper than about 63% of the 4,938 comparable items (median $107.99).
Total capacity 120 GB
Lower than about 96% of the 2,372 comparable items (median 2 TB).
Price per TB $599.92 per TB
Pricier than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda 7200.7
Model nameST3120026AS
Total capacity120 GB
Performance
Rotational speed7,200 RPM
Average seek time8.5 ms
Mean latency4.16 ms
Storage
Cache memory8 MB
Ports & slots
Interface typeSATA 1.5Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.57 kg
Package size146 × 102 × 25 mm

Questions about this item

What practical throughput does the SATA 1.5Gb/s interface cap this drive at?

The SATA 1.5Gb/s interface limits maximum transfer to 1.5 Gb/s, so real-world throughput will not exceed that ceiling.

What physical clearance and bay size does the 3.5" 1.0 inch low-profile form factor require?

It fits a standard 3.5" drive bay and needs 1.0 inch of vertical clearance for the low-profile height.

How is the bare drive installed, and which jumper step is often missed?

Mount it in a 3.5" bay, connect SATA data and power cables, and ensure no legacy master/slave jumper is set because SATA drives do not use them.

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