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Silver 3.5 inch bare hard drive with circuit board visible

HGST

HGST HDS724040KLAT80 400GB 7200 RPM 8MB IDE Ultra ATA100 3.5" internal hard drive

SKU CH-1P69-P6AKP MPN HDS724040KLAT80

A 400GB 3.5-inch desktop drive spinning at 7200 RPM with 8MB cache and IDE Ultra ATA100 interface

  • Total capacity400 GB
  • Interface typeIDE Ultra ATA100 / ATA-6
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory8 MB
  • 7200 RPM spindle speed delivers responsive data access
  • 400 GB capacity stores large media libraries and backups
  • 8 MB cache buffers bursts for smoother throughput
  • 5 ms average seek time reduces latency on random reads
  • Rotational vibration safeguard protects data integrity in multi-drive systems

Deskstar 7K400 400GB IDE drive

The HGST HDS724040KLAT80 is a 3.5 inch desktop hard drive with a 400GB capacity. It spins at 7200 RPM and includes an 8MB cache on an IDE Ultra ATA100 interface. The unit is supplied as a bare drive in new condition.

Suits legacy IDE systems; not for modern interfaces

This drive matches older desktops and industrial equipment that still require a parallel ATA connection. Builders working with current motherboards or external enclosures should look at something else because the interface is not compatible.

Deciding specification: IDE Ultra ATA100 interface

The parallel ATA connector determines whether this drive fits the target system. Average seek time is 8.5ms and rotational vibration safeguards are included for mechanical stability. No other specification overrides this compatibility requirement.

How it compares

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

Price $183.99
Pricier than about 66% of the 4,938 comparable items (median $107.99).
Total capacity 400 GB
Lower than about 84% of the 2,372 comparable items (median 2 TB).
Price per TB $459.98 per TB
Pricier than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameHitachi GST
Product lineDeskstar 7K400
Model nameHDS724040KLAT80 (0A30228)
Total capacity400 GB
Performance
Rotational speed7,200 RPM
Average seek time8.5 ms
Storage
Cache memory8 MB
Ports & slots
Interface typeIDE Ultra ATA100 / ATA-6
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.68 kg
Package size147 × 102 × 25 mm

Questions about this item

What does the 7200 RPM speed mean for daily use of this 400GB drive?

The 7200 RPM spindle delivers an 8.5ms average seek time, giving quicker file access than slower desktop drives of the same era.

What does the IDE Ultra ATA100 interface limit in practice?

The ATA-6 interface caps sustained transfers at 100 MB/s, so the drive cannot exceed that throughput even if the platters are faster.

Will this 3.5" bare drive fit a standard desktop drive bay?

Yes, the 3.5-inch form factor matches the mounting holes and dimensions of any regular desktop internal bay.

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