Hitachi Deskstar 7K1000.B 1000GB / 1TB 7.2K SATA Hard Drive 0A35155

Hitachi Part #/MPN: 0A35155

DiscTech Item #: HIT-0A35155-NP-3Y

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Capacity: 1TB

Speed: 7,200RPM

Interface Types: SATA

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Average Seek Time: 8.2 / 9.2

Electrical Interface: SATA 300 - 3.0Gbps

On-Board Cache: 32MB

Hitachi Deskstar 7K1000 1000GB / 1TB 7.2K SATA Hard Drive 0A35155 / HDS721010KLA330 - New Pull

An industry first, the Hitachi Deskstar 7K1000 hard disk drive delivers up to one terabyte of storage capacity for demanding consumer and commercial computing products. It leverages the industry’s most reliable perpendicular magnetic recording (PMR) techniques and the latest advancements in silent acoustics, shock protection, and head technology to maximize capacity, performance and fi eld reliability. Best-in-class power management and thermal emissions help manufacturers meet energy compliance targets and extend drive life.

Proven PMR technology
Field-proven in 2.5-in. drives, Hitachi’s PMR implementation continues to demonstrate reliability equal to or exceeding conventional longitudinal technology. The Deskstar 7K1000’s second-generation PMR head and media technology improves noise characteristics and thermal stability.

Reduced power idle modes
Unique to Hitachi drives, the Deskstar 7K1000 features three advanced low-power idle modes—active, unload and low-power. Together, they reduce power consumption at the drive level up to 20%, optimize non-operational latency and lower drive temperature for cooler system operation.

Outstanding shock resistance and power efficiency
Through a patented ramp load/unload design disk heads (in non-operating modes) are unloaded to a ramp outside the disk where they rest in a low-power ‘unload idle’ state until activated. In low RPM drives, this can reduce power by up to 50%. Ramp load/ unload provides tangible benefi ts for the drive and host product. It greatly minimizes the risk of shock damage by eliminating direct contact between the heads and disks. Reduced wear and heat improve overall drive reliability. In the event of power loss to the drive, heads are unloaded using energy extracted from the spinning disks. This patented power-saving feature helps to reduce overall maintenance costs and extends the drive service life. Another contributor to Deskstar 7K1000’s exceptional shock performance and power savings is the use of compact, low-mass femto air-bearing sliders.

Extended field reliability
An integrated thermal sensor monitors operating temperature, enabling the host processor to intelligently adjust airfl ow as needed for cooling. Sensor integration reduces component cost and increases reliability. Deskstar 7K1000’s thermal fl y-height control (TFC) uses an integrated heating element to precisely maintain a constant fl y-height throughout read and write operations. This reduces raw soft error rate and, in turn, improves overall data integrity, drive performance and reliability. Deskstar 7K1000’s iridium-manganese-chromium (IrMnCr) read head sensor technology offers better performance and reliability in harsh conditions.

Hitachi Design Studios
Located around the world, Hitachi Design Studios assist customers with all aspects of integrating hard drives into consumer electronic devices. Their services focus on drive selection, evaluation and optimization, integration and design-in consulting, software compatibility assessment, performance profi ling, problem analysis and reliability consulting.


Capacity: 1000GB / 1TB / 1 TB


This hard drive is compatible with any of our SATA hot-swappable trays.

Drive specification

0A35155 / HDS721010KLA330

Formatted Gbytes (512 bytes/sector)

1000GB / 1TB

Bytes per sector


Spindle speed (RPM)


I/O data transfer rate (Mbytes/sec max)


Cache buffer

32 Mbytes

Height (max)

26.11 mm (1.028 inches)

Width (max)

101.85 mm (4.010 inches)

Length (max)

146.99 mm (5.787 inches)

Weight (max) grams


Average seek, read (msec typical)


Startup current (typical) 12V (peak)

2.0 amps

Idle mode (typical) watts


Ambient temperature

5° to 60°C (op.)

–40° to 70°C (nonop.)

Click here to view the manufacturer's item description/brochure

Alternate MPNs: HDS721010KLA330

Weight: 1.8 lb

Warranty: 3 Year Manufacturer

New Pull

Condition Levels Explained

The product has been mounted in a brand new system (e.g. server), then removed from the system, before entering service. These products may have some hours of usage due to system build time / burn-in / testing etc. New Pulls are guaranteed to have at least 95% (often 99%) of their service life remaining , they may show signs of being physically mounted and dismounted. All handling is performed by trained technicians, taking full ESD precautions.

3 Year Manufacturer Warranty

Product Warranties Explained

The product has a manufacturer warranty for the time period specified.