First-party DMA commands | Hitachi HCS721016CLA382, HCS721050CLA382

SMART Enable Operations

SMART Execute Off-line Data Collection

SMART Return Status

SMART Save Attribute Values

SMART Enable/Disable Automatic Off-Line

Standby

Standby Immediate

Write Uncorrectable Ext

Execution of these commands involves no data transfer.

10.4DMA Data In commands and DMA Data Out commands

These commands are:

Read DMA

Read DMA Ext

Read Stream DMA

Write DMA

Write DMA Ext

Write DMA FUA Ext

Write Stream DMA

Execution of this class of command includes the transfer of one or more blocks of data between the device and the host using DMA transfer.

10.5First-party DMA commands

These commands are:

Read FPDMA Queued

Write FPDMA Queued

Execution of this class of commands includes command queuing and the transfer of one or more blocks of data between the device and the host. The protocol is described in the section 4.2 “Native Command Queuing” of “Serial ATA II: Extensions to Serial ATA 1.0a”.

Host knowledge of I/O priority may be transmitted to the device as part of the command. There are two priority classes for NCQ command as high priority, the host is requesting a better quality of service for that command than the commands issued with normal priority.

The classes are forms of soft priority. The device may choose to complete a normal priority command before an outstanding high priority command, although preference shallbe given to the high priority commands. The priority class is indicated in bit 7 (Priority Information) in the Sector Count register for NCQ commands (READ FPDMA QUEUED and WRITE FPDMA QUEUED). This bit can indicate either the normal priority or high priority class. If a command is marked by the host as high priority, the device shall attempt to provide better quality of service for the command. It is not required that devices process all high priority requests before satisfying normal priority requests.

Hitachi hard disk drive specifications

102 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.