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Silver rectangular 2.5 inch bare laptop hard drive with circuit board visible

HGST

HGST 0A78603 Travelstar Z5K320 320GB 5400 RPM 8MB Cache SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-7P9A-JT3XS MPN 0A78603

A 2.5 inch laptop hard drive with 320GB capacity, 5400 RPM speed, 8MB cache and a SATA 3.0Gb/s interface

  • Total capacity320 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Average seek time13 ms
  • 320 GB capacity stores up to 80 hours of HD video
  • 5400 RPM spindle with 8 MB cache delivers 994 Mb/s media transfer rate
  • 7 mm z-height fits slim 2.5 inch laptop bays
  • 6 W read/write power and 0.55 W idle extend battery life
  • 400 G operating shock and TrueTrack technology protect data during bumps

Capacity and form factor

The HGST Travelstar Z5K320 is a 320GB 2.5-inch internal hard drive designed for laptop upgrades or replacements. It operates at 5400 RPM with an 8MB cache and connects through a SATA 3.0Gb/s interface.

Upgrade considerations

This drive replaces older 2.5-inch SATA laptop drives with lower capacity or slower performance. The jump is worth it when you need more space for media or applications and your system supports the 9.5mm z-height.

Installation notes

The bare drive fits standard 2.5-inch drive bays using the SATA data and power connectors. No special tools are required beyond a small screwdriver. Ensure the laptop chassis accepts a 9.5mm drive height, as some ultra-thin models only accept 7mm drives.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $79.99
Pricier than about 57% of the 645 comparable items (median $66.99).
Total capacity 320 GB
Typical for this category: the median of 419 items is 320 GB.
Price per TB $249.97 per TB
Typical for this category: the median of 416 items is $233.48 per TB.

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Specifications

Product
Brand nameHGST
Product lineTravelstar Z5K320
Model nameHTS543232A7A384 (Part#: 0A78603)
Total capacity320 GB
Performance
Average seek time13 ms
Mean latency5.5 ms
Rotational speed5,400 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Max height9.5 mm
Maximum width69.75 mm
Maximum length100.3 mm
Shipping weight0.09 kg
Package size102 × 76 × 6 mm

Questions about this item

Will the 9.5 mm height fit my laptop's 2.5 inch bay?

The drive is a 2.5 inch form factor with a maximum height of 9.5 mm, matching the standard laptop bay size.

Does the SATA 3.0 Gb/s connector need any special alignment during installation?

The SATA data and power connectors are keyed; insert them straight until they click — forcing them at an angle bends the pins.

How often should I check the drive's 400 G operating shock rating?

The 400 G operating shock rating is a design specification, not a maintenance interval; run SMART checks periodically instead.

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