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Hitachi HDS723020BLA642 manual Write Uncorrectable Ext 45h, Write Uncorrectable Ext Command 45h

Models: HDS723020BLA642

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7K200 SATA OEM Specification

14.53Write Uncorrectable Ext (45h)

 

Command Block Output Registers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Command Block Input Registers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register

 

 

 

7

 

 

6

 

 

5

 

 

4

 

 

3

 

 

2

 

 

1

 

0

 

Register

 

 

 

7

 

 

 

6

 

5

 

 

4

3

 

 

 

2

 

1

 

 

 

0

 

Data Low

 

 

-

 

-

 

-

 

-

 

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-

 

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Data Low

 

 

 

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Data High

 

 

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Data High

 

 

 

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Feature

 

 

Current

 

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Error

 

 

 

 

 

 

 

 

 

 

 

...See Below...

 

 

 

 

 

 

 

 

 

 

Previous

 

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Sector Count

Current

 

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Sector Count

 

HOB=0

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HOB=1

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Device

 

 

 

 

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Device

 

 

 

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...See Below...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Error Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Status Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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CRC

 

UNC

 

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IDN

0

 

 

 

ABT

 

 

T0N

 

 

AMN

 

BSY

 

RDY

 

DF

DSC

DRQ

 

COR

IDX

ERR

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V

Table 137 Write Uncorrectable Ext Command (45h)

The Write Uncorrectable Ext command is used to cause the device to report an uncorrectable error when the target sector is subsequently read.

When the feature field contains a value of 5xh, the Write Uncorrectable Ext command causes the device to indicate a failure when reads to any of the sectors that are contained in specified sectors. Theses sectors are referred to as “pseudo uncorrectable” sectors. In this case whenever a pseudo uncorrectable sector is accessed via a read command, the device performs normal error recovery and then set the UNC and ERR bits to indicate she sector is bad.

When the feature field contains a value of Axh, the Write Uncorrectable Ext command causes the device to flag the specified sector as “flagged uncorrectable”. Flagging a logical sector as uncorrectable causes the device to indicate a failure when reads to specified sectors are performed. These sectors are referred to as “flagged uncorrectable” sectors. In this case whenever a “flagged uncorrectable” sector is accessed via a read command, the device sets the UNC and ERR bits without normal error recovery to indicate the sector is bad.

If the Uncorrectable options are set to A5h or 55h, then sectors that have been made pseudo uncorrectable are listed as failed in the standard error logs when read back. If the Uncorrectable options are set to 5Ah or AAh, then the reading of pseudo uncorrectable sectors are not logged as an error in any standardized error logs.

The pseudo uncorrectable or flagged uncorrectable status of a sector remains through a power cycle.

If an uncorrectable error occurs, the write will be terminated at the failing sector.

Output Parameters To The Device

Feature Current Uncorrectable options

55h : Create a pseudo uncorrectable error with logging

5Ah: Create a pseudo uncorrectable error without logging

A5h: Create a flagged error with logging

AAh: Create a flagged error without logging

Other: Reserved (command is aborted)

Sector Count Current The number of continuous sectors to be marked low order, bits (7:0).

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Hitachi HDS723020BLA642 manual Write Uncorrectable Ext 45h, Write Uncorrectable Ext Command 45h
Page 168 Page 170

HDS723020BLA642 specifications

The Hitachi HDS723020BLA642 is a high-performance hard disk drive that exemplifies the balance between reliability and advanced technology, making it an excellent choice for a range of applications, from desktop computers to enterprise storage solutions. This 2TB SATA hard drive is designed to meet the growing data storage needs of users who demand both speed and efficiency.

One of the key features of the HDS723020BLA642 is its impressive rotational speed of 7200 RPM. This speed facilitates faster data access and improved overall performance, significantly enhancing the user experience during data-intensive operations such as gaming, video editing, and large file transfers. Coupled with a SATA III interface, this drive facilitates data transfer rates of up to 6 Gb/s, providing an efficient conduit for moving data quickly between the hard drive and the motherboard.

The drive comes equipped with a large 64 MB cache, which plays a crucial role in buffering read and write operations. This substantial amount of cache memory allows the drive to temporarily store frequently accessed data, leading to reduced latency and enabling smoother multitasking capabilities. Users will benefit from faster load times and reduced wait periods when working with large files.

Reliability is another defining characteristic of the HDS723020BLA642. Hitachi, now a part of Western Digital, has a longstanding reputation for producing durable hard drives. This model incorporates advanced technologies, such as the Fluid Dynamic Bearing (FDB) for quieter operation and better longevity. The drive also features an enhanced error recovery system that minimizes the risk of data loss, making it a suitable option for both personal and professional use.

In terms of power efficiency, the HDS723020BLA642 is designed to consume less power during operation compared to older hard drive models. This efficiency not only helps in reducing operational costs but also contributes to a longer lifespan for the drive itself.

Overall, the Hitachi HDS723020BLA642 hard drive combines speed, reliability, and efficiency into a compact package, making it an ideal choice for users needing a substantial amount of storage without compromising on performance. Whether for upgrading an existing system or building a new one, this drive offers a blend of technology and durability that caters to modern storage demands.