9 General Operation Descriptions

9.1Reset Response

There are three types of reset in ATA as follows:

Power On Reset (POR)

The device executes a series of electrical circuitry diagnostics, spins

 

up the HDA, tests speed and other mechanical parametric, and sets

 

default values.

COMRESET

COMRESET is issued in Serial ATA bus.

 

The device resets the interface circuitry as well as Soft Reset.

Soft Reset (Software Reset)

SRST bit in the Device Control Register is set, and then is reset.

 

The device resets the interface circuitry according to the Set Features

 

requirement.

The actions of each reset are shown in Table 33.

 

 

 

POR

COMRESET

Soft Reset

 

 

 

 

 

 

Aborting Host interface

-

o

o

 

Aborting Device operation

-

(*1)

(*1)

 

Initialization of hardware

o

x

x

 

Internal diagnostic

o

x

x

 

Spinning spindle

o

x

x

 

Initialization of registers (*2)

o

o

o

 

Reverting programmed parameters to default

o

(*3)

(*3)

 

- Number of CHS

 

 

 

 

(set by Initialize Device Parameter)

 

 

 

 

- Multiple mode

 

 

 

 

- Write cache

 

 

 

 

- Read look-ahead

 

 

 

 

- ECC bytes

 

 

 

 

Disable Standby timer

o

x

x

 

Power mode

(*5)

(*4)

(*4)

o

----

execute

 

 

 

x

----

not execute

 

 

 

Table 33 Reset Response

Table Notes

(*1)Execute after the data in write cache has been written.

(*2) Default value on POR is shown in 0 Default Register Values on page55.

(*3) The Set Features command with Feature register = CCh enables the device to revert these parameters to the power on defaults.

(*4) In the case of Sleep mode, the device goes to Standby mode. In other case, the device does not change current mode.

(*5) Idle when Power-Up in Standby feature set is disabled. Standby when Power-Up in Standby feature set is enabled.

Hitachi hard disk drive specifications

54

Page 54
Image 54
Hitachi HDS721064CLA332, HCS721050CLA382, HCS721032CLA382 Reset Response, Power On Reset POR, Soft Reset Software Reset

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.