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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

  • PackagingBare Drive
  • InterfaceSATA 3.0Gb/s
  • Capacity320GB
  • Cache8MB
  • Average Seek Time13ms
  • Average Latency5.5ms
  • 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.

Highlights

  • 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

Specifications

BrandHGST
SeriesTravelstar Z5K320
ModelHTS543232A7A384 (Part#: 0A78603)
PackagingBare Drive
InterfaceSATA 3.0Gb/s
Capacity320GB
Cache8MB
Average Seek Time13ms
Average Latency5.5ms
RPM5400 RPM
FeaturesNew 7mm z-height for greater design flexability
Up to 320GB storage - Up to 80 hours of high-definition video, 320 hours of standard video, 114 movies, 80,000 4-min songs or 160 games
1.6W read/write power - Low energy use and long battery life for
0.55W low power idle - more "unplugged" notebook time
400G operating shock - Robust design to help protect against bumps and
1000G non-operating shock - rough handling
TrueTrack technology - Prevents slow performance or errors in high shock or vibration environments
Improved acoustics - Quieter for a richer audio-listening experience for m
Form Factor2.5"
Height (maximum)9.5mm
Width (maximum)69.75mm
Length (maximum)100.3mm
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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