8.13Status Register

Status Register

7

6

5

4

3

2

1

0

BSY

DRDY

DF

DSC

DRQ

CORR

IDX

ERR

/SERV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 32

Status Register

 

 

 

 

 

This register contains the device status. The contents of this register are updated whenever an error occurs and at the completion of each command.

If the host reads this register when an interrupt is pending, it is considered to be the interrupt acknowledge. Any pending interrupt is cleared whenever this register is read.

If BSY=1, no other bits in the register are valid.

Bit Definitions

 

BSY

Busy. BSY=1 whenever the device is accessing the registers. The host should not read or

 

write any registers when BSY=1. If the host reads any register when BSY=1, the contents of

 

the Status Register will be returned.

DRDY (RDY)

Device Ready. RDY=1 indicates that the device is capable of responding to a command.

 

RDY will be set to 0 during power on until the device is ready to accept a command. If the

 

device detects an error while processing a command, RDY is set to 0 until the Status Register

 

is read by the host, at which time RDY is set back to 1.

DF

Device Fault. This product does not support DF bit. DF bit is always zero.

DSC

Device Seek Complete. DSC=1 indicates that a seek has completed and the device head is

 

settled over a track. DSC is set to 0 by the device just before a seek begins. When an error

 

occurs, this bit is not changed until the Status Register is read by the host, at which time the

 

bit again indicates the current seek complete status.

 

When the device enters into or is in Standby mode or Sleep mode, this bit is set by device in

 

spite of not spinning up.

SERV (SRV)

Service. This product does not support SERV bit.

DRQ

Data Request. DRQ=1 indicates that the device is ready to transfer a word or byte of data

 

between the host and the device. The host should not write the Command register when

 

DRQ=1.

CORR (COR)

Corrected Data. Always 0.

IDX

Index. IDX=1 once per revolution. Since IDX=1 only for a very short time during each

 

revolution, the host may not see it set to 1 even if the host is reading the Status Register

 

continuously. Therefore, the host should not attempt to use IDX for timing purposes.

ERR

Error. ERR=1 indicates that an error occurred during execution of the previous command.

 

The Error Register should be read to determine the error type. The device sets ERR=0 when

 

the next command is received from the host.

Hitachi hard disk drive specifications

53

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Hitachi HDS721075CLA332, HCS721050CLA382, HCS721032CLA382, HCS721025CLA382, HCS721075CLA332, HUA722010CLA330/1 Status Register
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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.
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