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Silver 3.5 inch SATA hard drive bare drive with circuit board visible

Seagate

Seagate BarraCuda 7200.7 ST3120827AS 120GB 7200 RPM 8MB SATA 1.5Gb/s 3.5" internal hard drive

SKU CH-ZT4B-668VP MPN ST3120827AS

A 120 GB 3.5-inch desktop drive with 7200 RPM, 8 MB cache and 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 delivers responsive desktop performance
  • 8 MB cache buffers frequent read and write operations
  • SATA 1.5 Gb/s interface connects to standard motherboard ports
  • 350 Gs non-operating shock rating protects stored data during handling
  • 3D Defense System helps maintain drive reliability over time

120 GB desktop hard drive

The Seagate BarraCuda 7200.7 ST3120827AS is a 120 GB 3.5-inch internal hard drive built for desktop systems. It connects through a SATA 1.5Gb/s interface and spins at 7200 RPM with an 8 MB cache. The drive suits users adding affordable bulk storage to older or secondary PCs.

7200 RPM thermal and acoustic profile

At 7200 RPM the drive produces typical mechanical noise and heat for its class; the 8.5 ms average seek time and 4.16 ms latency reflect standard desktop workloads. The bare-drive packaging means no extra mounting hardware or acoustic dampening is included. Builders who need silent operation or laptop form factors should look elsewhere.

SATA NCQ and 3D Defense System

Native Command Queuing on the SATA link reorders read and write commands to reduce head movement. The 3D Defense System and 350 Gs non-operating shock rating protect the platters during handling and unexpected impacts. No software utilities or cables are bundled with the bare drive.

How it compares

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

Price $45.99
Cheaper than about 81% 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 $383.25 per TB
Pricier than about 88% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda 7200.7
Model nameST3120827AS
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 weight0.68 kg
Package size203 × 152 × 51 mm

Questions about this item

How do I install the ST3120827AS in a desktop and which step is often missed?

Mount the 3.5" drive in a bay, connect the SATA data and power cables, then enable the SATA port in BIOS so the 120GB volume appears.

What maintenance or replacement will the BarraCuda 7200.7 need over time?

No routine service is required; plan to replace the drive once SMART attributes report reallocated sectors or after the five-year limited period.

What limit appears first during sustained transfers on the ST3120827AS?

The SATA 1.5Gb/s interface caps throughput well below the 7200 RPM platters' sustained rate, making the bus the first bottleneck.

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