9.7Host Protected Area Feature

Host Protected Area Feature is to provide the 'protected area' which can not be accessed via conventional method. This 'protected area' is used to contain critical system data such as BIOS or system management information. The contents of entire system main memory may also be dumped into 'protected area' to resume after system power off.

The LBA/CYL changed by following command affects the Identify Device Information. The following set of commands is implemented for this function.

Read Native Max ADDRESS

('F8'h)

Set Max ADDRESS

('F9'h)

9.7.1 Example for operation (In LBA mode)

Assumptions:

For better understanding, the following example uses actual values for LBA, size, etc. Since it is just an example, these values could be different.

Device characteristics

Capacity (native)

:

6,498,680,832

byte (6.4GB)

Max LBA (native)

:

12,692,735

(0FFFFFh)

Required size for protected area

:

206,438,400

byte

Required blocks for protected area

:

403,200

(062700h)

Customer usable device size

:

6,292,242,432

byte (6.2GB)

Customer usable sector count

:

12,289,536

(BB8600h)

LBA range for protected area

:

BB8600h to C1ACFFh

1.Shipping HDDs from HDD manufacturer

When the HDDs are shipped from HDD manufacturer, the device has been tested to have usable capacity of 6.4GB besides flagged media defects not to be visible by system.

2.Preparing HDDs at system manufacturer

Special utility software is required to define the size of protected area and store the data into it. The sequence is:

Issue Read Native Max Address command to get the real device maximum LBA. Returned value shows that native device Maximum LBA is 12,692,735 (C1ACFFh) regardless of the current setting.

Make entire device be accessible including the protected area by setting device Maximum LBA as 12,692,735 (C1ACFFh) via Set Max Address command. The option could be either nonvolatile or volatile.

Test the sectors for protected area (LBA >= 12,289,536 (BB8600h)) if required.

Hitachi hard disk drive specifications

67

Page 66 Page 68
Page 67
Image 67
Hitachi A7K2000, HCS721050CLA382, HCS721032CLA382, 7K1000C Host Protected Area Feature, Example for operation In LBA mode
Page 66 Page 68

HCS721016CLA382, HCS721050CLA382, HCS721025CLA382, HDP725050GLA360, HUA722050CLA330/1 specifications

Hitachi's lineup of hard disk drives, including models such as HDS721075CLA632, HDS721032CLA362, HDS721032CLA662, HDS721050CLA362, and DSDS7210C09EN-04, offers a variety of features catering to different storage needs. These drives are widely recognized for their reliability, performance, and efficiency, making them suitable for both consumer and enterprise applications.

The HDS721075CLA632 model, with a capacity of 750GB, strikes a balance between performance and storage capabilities. It operates at 7200 RPM, ensuring quick access to data while maintaining low latency. Its 32MB cache enhances data transfer rates and improves overall system responsiveness. This HDD is particularly useful for gaming, multimedia, and office applications, allowing users to store a substantial amount of data with quick retrieval times.

The HDS721032CLA362 and HDS721032CLA662 share many similarities and are both designed for budget-conscious consumers. With a capacity of 320GB and a 7200 RPM, they offer efficient storage solutions for everyday tasks. The 32MB cache buffer enables efficient caching of frequently accessed files, providing a smooth experience for users.

Another notable model is the HDS721050CLA362, which features a capacity of 500GB. Like its counterparts, this drive operates at a speed of 7200 RPM and utilizes a 32MB cache, which ensures optimal performance for data-heavy applications. This model stands out for its energy efficiency, resulting in lower operational costs, making it an appealing choice for businesses and energy-conscious consumers alike.

On the other hand, the DSDS7210C09EN-04 is a part of Hitachi's enterprise-oriented offerings. This drive is engineered for demanding applications, featuring advanced technologies such as error recovery controls and enhanced data protection features. With a focus on reliability and performance, the DSDS7210C09EN-04 serves well in server environments and for high-performance computing.

Hitachi's hard drives incorporate various technologies that enhance their performance and durability. Features such as staggered start-up, which gradually powers on the drive, help minimize power surges and increase the longevity of the device. Moreover, Hitachi's commitment to quality ensures that each drive undergoes rigorous testing, guaranteeing functionality and reliability.

Overall, the diverse range of models from Hitachi provides effective solutions for anyone from casual users to enterprises, combining storage capacity with advanced technologies to meet the evolving demands of modern data storage.
Top Page Image Contents