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Silver 3.5 inch bare hard drive with green circuit board visible

Seagate

Seagate ST3640323AS 640GB 7200 RPM 32MB SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-5T7M-34V1V MPN ST3640323AS

A 640GB 3.5" desktop drive with 7200 RPM and 32MB cache over SATA 3.0Gb/s

  • Total capacity640 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory32 MB
  • 640 GB capacity stores large media libraries
  • 7200 RPM spindle speed delivers fast data access
  • 32 MB cache buffer improves burst performance
  • SATA 3.0 Gb/s interface fits standard desktop ports
  • 5 inch form factor matches typical drive bays

Capacity and interface

This Seagate desktop drive provides 640GB of storage on a SATA 3.0Gb/s connection. It spins at 7200 RPM with a 32MB cache in a standard 3.5 inch form factor. The unit is supplied as a bare drive without cables or brackets. It is a new component intended for internal installation.

Suitable builds and limits

The drive suits older desktops or secondary storage roles where a 3.5 inch SATA bay is available. Builders needing higher capacity, faster transfer rates or a 2.5 inch form factor should consider other options. Systems that only support M.2 or PCIe storage cannot use this drive. Laptops and small form factor cases without 3.5 inch mounts are also incompatible.

Deciding specification

The SATA 3.0Gb/s interface is the single specification that determines whether this drive fits your system. Your motherboard or controller must provide a matching SATA port and the case must accommodate a 3.5 inch device. Without that interface and physical space the drive cannot be installed.

How it compares

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

Price $48.99
Cheaper than about 78% of the 4,938 comparable items (median $107.99).
Total capacity 640 GB
Lower than about 74% of the 2,372 comparable items (median 2 TB).
Price per TB $76.55 per TB
Pricier than about 56% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Model nameST3640323AS
Total capacity640 GB
Performance
Rotational speed7,200 RPM
Storage
Cache memory32 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.61 kg
Package size151 × 102 × 25 mm

Questions about this item

Does the ST3640323AS need a 3.5-inch drive bay and a SATA power connector to operate?

Yes, the 3.5-inch form factor requires a standard desktop drive bay and the drive draws power through a SATA power connector from the PSU.

Will the ST3640323AS work on a motherboard that only supports SATA 3.0Gb/s?

The drive uses a SATA 3.0Gb/s interface so it runs at full speed on a matching port and remains compatible with slower SATA ports.

How can I confirm the ST3640323AS is running at 7200 RPM after installation?

Check the model ST3640323AS in BIOS or use a tool such as CrystalDiskInfo to verify the reported rotation speed shows 7200 RPM.

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