4.1.7Identify Device command

The Identify Device command (command code ECH) transfers information about the drive to the host following power up. The data is organized as a single 512-byte block of data. All reserved bits or words should be set to zero. Parameters listed with an “x” are drive-specific or vary with the state of the drive. See Section 2.0 on page 5 for default parameter settings.

The following commands contain drive-specific features that may not be included in the Draft ATA-7 Standard.

Word

Description

Value

 

 

 

0

Configuration information:

0C5AH

 

• Bit 15: 0 = ATA; 1 = ATAPI

 

 

• Bit 7: removable media

 

 

• Bit 6: removable controller

 

 

• Bit 0: reserved

 

 

 

 

1

Number of logical cylinders

16,383

 

 

 

2

ATA-reserved

0000H

 

 

 

3

Number of logical heads

16

 

 

 

4

Retired

0000H

 

 

 

5

Retired

0000H

 

 

 

6

Number of logical sectors per logical track: 63

003FH

 

 

 

7–9

Retired

0000H

 

 

 

10–19

Serial number: (20 ASCII characters, 0000H = none)

ASCII

 

 

 

20

Retired

0000H

 

 

 

21

Retired

0400H

 

 

 

22

Obsolete

0000H

 

 

 

23–26

Firmware revision

x.xx

 

(8 ASCII character string, padded with blanks to end of string)

 

 

 

 

27–46

Drive model number (40 ASCII characters, padded with blanks

ST9120826A

 

to end of string)

ST9100826A

 

 

ST980821A

 

 

ST960814A

 

 

ST940811A

 

 

 

47

(Bits 7–0) Maximum sectors per interrupt on Read multiple and

8001H

 

Write multiple (16)

 

 

 

 

48

Reserved

0000H

 

 

 

49

Standard Standby timer, IORDY supported and may be disabled

2F00H

 

 

 

50

ATA-reserved

4000H

 

 

 

51

PIO data-transfer cycle timing mode

0200H

 

 

 

52

Retired

0200H

 

 

 

53

Words 54–58, 64–70 and 88 are valid

0007H

 

 

 

54

Number of current logical cylinders

xxxxH

 

 

 

55

Number of current logical heads

xxxxH

 

 

 

56

Number of current logical sectors per logical track

xxxxH

 

 

 

57–58

Current capacity in sectors

xxxxH

 

 

 

Momentus 5400 FDE Product Manual, Rev. C

35

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Seagate ST9100826A, ST960814A, ST980821A, ST9120826A, ST940811A manual Identify Device command, Word Description Value
Page 40 Page 42

ST940811A, ST960814A, ST9120826A, ST980821A, ST9100826A specifications

Seagate's ST9100826A, ST980821A, ST9120826A, ST960814A, and ST940811A hard drives represent some of the company's commitment to providing reliable and high-performance storage solutions. Each model features distinct specifications and technologies that cater to various data storage needs.

The ST9100826A is a 100 GB hard drive that utilizes a 7200 RPM spindle speed, ensuring quick data access and transfer rates. With an IDE interface, this drive supports a data transfer rate of up to 100 MB/s, making it suitable for intensive applications. Additionally, the ST9100826A comes equipped with a 2 MB cache, optimizing data retrieval speeds and enhancing overall performance.

Moving to the ST980821A, this 80 GB drive also operates at 7200 RPM and features a similar IDE interface, which offers compatible integration with various systems. Designed with reliability in mind, it boasts a mean time between failures (MTBF) rating of 1 million hours, appealing to users who prioritize durability. This drive’s compact size allows it to fit seamlessly into a range of configurations, from personal computers to external enclosures.

The ST9120826A, with a substantial capacity of 120 GB, continues the trend of high-performance drives in this lineup. Its 7200 RPM speed and 2 MB cache ensure that users experience efficient data handling. With a more advanced read/write head technology, the drive also minimizes noise during operation, making it suitable for both desktop environments and home media centers.

The ST960814A comes with a 60 GB storage capacity and features an ultra-slim design, making it an excellent choice for portable devices. Often favored by users needing external storage for laptops or gaming consoles, this model maintains a 5400 RPM speed while providing commendable performance and durability, making data retrieval swift and smooth.

Lastly, the ST940811A, featuring a compact 40 GB capacity, serves as a versatile option for users looking to upgrade their existing systems. With an IDE connection and a design focused on energy efficiency, this drive is perfect for economical builds while still providing good performance for standard applications.

In summary, Seagate’s ST9100826A, ST980821A, ST9120826A, ST960814A, and ST940811A each demonstrate innovative features and reliability across various storage needs. With diverse capacities, spindle speeds, and robust technologies, they solidify Seagate’s reputation as a leader in data storage solutions.
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