9.18.2SCT Command Protocol

9.18.2.1Command Transport

SCT Command Transport occurs when a 512-byte data packet (called “Key Sector”) is created and the written to SMART or extended log page E0h. The key sector specifies Action and Function Codes along with the parameters that are required to perform the action.

9.18.2.1.1Issue SCT Command Using SMART

Command Block Output Registers

Register

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

Feature

 

 

 

D6h

 

 

 

 

 

 

 

 

 

 

 

Sector Count

 

 

 

01h

 

 

 

 

 

 

 

 

 

 

 

Sector Number

 

 

 

E0h

 

 

 

 

 

 

 

 

 

 

 

Cylinder Low

 

 

 

4Fh

 

 

 

 

 

 

 

 

 

 

 

Cylinder High

 

 

 

C2h

 

 

 

 

 

 

 

 

 

 

 

 

Device/Head

-

-

-

D

-

-

-

-

 

 

 

 

 

 

 

 

 

Command

 

 

 

B0h

 

 

 

 

 

 

 

 

 

 

 

 

Table 43 Output Registers of SCT Command Using SMART

Command Block Input Registers (Success)

Register

7

 

6

 

5

4

3

2

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

Error

 

 

 

 

 

00h

 

 

 

 

 

 

 

Sector Count

Depends on command

 

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

Sector Number

Depends on command

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

Cylinder Low

 

Number of sectors to

 

 

 

 

 

transfer (LSB)

 

 

 

 

 

 

 

Cylinder High

 

Number of sectors to

 

 

 

 

 

transfer (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Device/Head

-

 

-

 

-

-

-

-

 

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Status

 

 

 

 

 

50h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Command Block Input Registers (Error)

Register

7

 

6

 

5

4

3

2

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

Error

 

 

 

 

 

04h

 

 

 

 

 

 

 

 

 

Sector Count

 

Extended Status code

 

 

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

Sector Number

 

Extended Status code

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

Cylinder Low

 

Number of sectors to

 

 

 

 

 

transfer (LSB)

 

 

 

 

 

 

 

Cylinder High

 

Number of sectors to

 

 

 

 

 

transfer (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Device/Head

-

 

-

 

-

-

-

-

 

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Status

 

 

 

 

 

51h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 44 Input Registers of SCT Command Using SMART

Hitachi hard disk drive specifications

83

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Hitachi HDP725050GLA360, HCS721050CLA382, A7K2000 SCT Command Protocol, Command Transport, Issue SCT Command Using Smart

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.

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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.

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