Hitachi Endurastar J4K50 - 40.0GB 4260RPM Ultra ATA-100Mb/s 8MB Cache 2.5" 9.5mm Laptop Hard Drive - HEJ425040F9AT00


Warranty90 Day Warranty
AvailabilityYes - Ships in 3 to 5 Days
ManufacturerHitachi Global Storage Technology
SeriesHitachi Endurastar J4K50
UPC CodeDoes Not Apply

Product Specs

Product Specs
Capacity40.0 GB
Spindle Speed4260 RPM High Endurance Fluid Dynamic (FDB) Motor
Cache Buffer8 MB Intelligent Caching
Advanced FormatNo - 512 Sector Size (Bytes)
Form Factor2.5 Inch Internal Hard Drive
InterfacePATA (EIDE Ultra-DMA ATA-6)
Interface SpeedUltra DMA Mode-5 - ATA 100MB/sec
Data Transfer Rateup to 100MB/sec Host to/from Drive (Sustained)
Interface ConnectorPATA (44-Pin Signal/Power and 4-Pin Jumper)
Recording TechnologyPerpendicular Magnetic Recording (PMR) Technology
Life Expectancy300,000 Hours MTTF (Mean Time To Failures)
Workload Rating< 55 TB/yr (Workload Rate Limit) / 600,000 (Load/Unload Cycles)
Shock ResistanceOperating: 250Gs / 2ms - Non Operating: 800Gs / 1ms (half sine wave)
EncryptionNo - Standard Model
Rohs CompliantYes
Dimensions(L x W x H) 100.5mm x 70.0mm x 9.5mm
Part Number0A60003, 0A60005
ClassificationEndurance Drives

Key Features

  • Capacities up to 50GB
  • Built to run in 24/7 (always-on) Environments
  • Built for Extreme Temperature Environments
  • Shock Sensor Technology
  • 4260RPM Rotational Speed Motor
  • Read Multiple and Write Multiple Command Support
  • Intelligent Caching Technology
  • Full Track Multiple Sector Transfer Technology
  • Enhanced Humidity Absorption Technology
  • Perpendicular Magnetic Recording (PMR) Technology
  • 600,000 Load/Unload Cycles for Data Integrity
  • TrueTrack Servo Technology
  • Thermal Fly Height Control Technology
  • Enhanced Error Correction Code (ECC) Technology
  • Staggered Spin-Up Technology
  • High Endurance Fluid Dynamic Bearing (FDB) Motors

Hitachi Endurastar J4K50 Hard Drives

Built Like a Tank

Hitachi is first to deliver a 50GB per platter Endurastar hard drive for use in extreme environments. The Endurastar J4K50 and N4K50 are offered in capacities of 30GB to 50GB. Along with the increased capacity, comes a wider temperature range and improved altitude range. Endurastar J4K50 is designed to operate in the most severe conditions, at temperatures of -30°C to+85°C and altitudes of -300 to +5000 meters. Endurastar N4K50 offers a temperature range of -16°C to +70°C at altitudes of -300 to 3000 meters. The new Endurastar models continue to leverage shock sensor technology for enhanced reliability and the proven technology of Hitachi HDDs for notebook PCs to deliver quiet acoustics and excellent performance. Hitachi Endurastar drives are designed to guard and deliver your data under the harshest environmental conditions.

Made for the Road

Hitachi Endurastar hard drives deliver the one-two punch of operating at the highest altitude and the most extreme temperatures. These drives are designed to meet the rigors of the automotive environment, including traditional navigation, telematics, in-car entertainment and vehicle relational management. This time-proven design supports around-the-clock applications in industrial environments.

The implementation of TFC, which enables direct control of the read/write element using heat, provides more consistent spacing between the read/write element and the media, thereby improving robustness and performance. These new Endurastar models are preferred for applications in the most radical environments ranging from desert heat to Antartic chill.


  • Highest capacity Automotive HDD at 50GB; 67% more than prior model.
  • Expanded operating temperature range from -30° C to +85° C.
  • Highest operating altitude range of up to 5000 meters.
  • 4th generation product, based on proven technology.


  • Automotive
  • GPS Navigation Systems
  • Applications Running in Hot and Humid Climates
  • Industrial Applications
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