7K200 SATA OEM Specification

14.14Read DMA Ext (25h)

 

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

 

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

Data Low

 

 

 

-

 

-

 

-

 

-

-

 

-

 

-

 

-

 

Data High

 

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

Data High

 

 

 

-

 

-

 

-

 

-

-

 

-

 

-

 

-

 

Feature

 

 

Current

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

-

 

Error

 

 

 

 

 

 

 

 

 

 

 

...See Below...

 

 

 

 

 

 

 

 

 

 

Previous

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

 

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sector Count

Current

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

Sector Count

 

HOB=0

-

 

-

 

-

 

-

-

 

 

-

 

-

 

 

-

 

 

 

 

 

Previous

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

 

 

 

 

 

HOB=1

-

 

 

-

 

-

 

-

-

 

 

-

 

-

 

 

 

-

 

LBA Low

Current

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

LBA Low

 

HOB=0

V

 

 

V

 

V

 

V

V

 

V

 

V

 

 

V

 

 

 

 

 

Previous

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

 

 

 

 

 

HOB=1

V

 

 

V

 

V

 

V

V

 

V

 

V

 

 

V

 

LBA Mid

Current

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

LBA Mid

 

HOB=0

V

 

 

V

 

V

 

V

V

 

V

 

V

 

 

V

 

 

 

 

 

Previous

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

 

 

 

 

 

HOB=1

V

 

 

V

 

V

 

V V V

V

 

 

V

 

LBA High

Current

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

LBA High

 

HOB=0

V

V

V

V

V

V

V

V

 

 

 

 

 

Previous

 

V

 

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

 

V

 

V

 

 

 

 

 

 

HOB=1

V

 

 

 

V

 

V

 

 

V

V

 

 

 

V

V

 

 

 

V

 

Device

 

 

 

 

-

 

1

 

-

 

-

 

-

 

-

 

-

 

-

 

Device

 

 

 

-

 

-

 

-

 

-

-

 

-

 

-

 

-

 

Command

 

 

0

 

0

 

1

 

0

 

0

 

1

 

0

 

1

 

Status

 

 

 

 

 

 

 

 

 

...See Below...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Error Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Status Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

6

 

5

4

3

 

 

 

 

2

 

 

 

1

 

 

 

0

 

 

7

 

6

 

5

 

4

 

3

 

 

2

 

1

 

 

0

 

CRC

 

UNC

 

0

IDN

0

 

 

 

ABT

 

 

T0N

 

 

AMN

 

BSY

 

RDY

 

DF

DSC

DRQ

 

COR

IDX

ERR

 

V

 

V

 

0

V

0

 

 

 

 

 

V

 

 

 

0

 

 

 

0

 

 

0

 

V

 

0

 

V

 

-

 

 

0

 

0

 

 

V

Table 69 Read DMA Ext Command (25h)

The Read DMA Ext command reads one or more sectors of data from disk media, then transfers the data from the device to the host.

The sectors are transferred through the Data Register 16 bits at a time.

The host initializes a slave-DMA channel prior to issuing the command. The data transfers are qualified by DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per command to indicate that data transfer has terminated and status is available.

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

Output Parameters To The Device

Sector Count Current

The number of sectors to be transferred low order, bits (7:0).

Sector Count Previous

The number of sectors to be transferred high order, bits (15:8). If 0000h in the Sector

 

Count register is specified, then 65,536 sectors will be transferred.

LBA Low Current

LBA (7:0)

LBA Low Previous

LBA (31:24)

LBA Mid Current

LBA (15:8)

LBA Mid Previous

LBA (39:32)

LBA High Current

LBA (23:16)

LBA High Previous

LBA (47:40)

Input Parameters From The

Device

LBA Low (HOB=0)

LBA (7:0) of the address of the first unrecoverable error.

LBA Low (HOB=1)

LBA (31:24)of the address of the first unrecoverable error.

LBA Mid (HOB=0)

LBA (15:8)of the address of the first unrecoverable error.

LBA Mid (HOB=1)

LBA (39:32)of the address of the first unrecoverable error.

LBA High (HOB=0)

LBA (23:16)of the address of the first unrecoverable error.

LBA High (HOB=1)

LBA (47:40)of the address of the first unrecoverable error.

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Hitachi HDS723020BLA642 manual Read DMA Ext 25h, Read DMA Ext Command 25h
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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.
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