Seagate ST9750422AS, ST9750424AS, ST9750423ASG, ST9750420ASG, ST9640422AS, ST9640423ASG XxxxH

Models: ST9500428AS ST9640422AS ST9750423ASG ST9750420AS ST9750420ASG ST9750424AS ST9640423AS ST9500424AS ST9640424AS ST9500423AS ST9640423ASG ST9500423ASG ST9750423AS ST9750422AS

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Word

Description

Value

 

 

 

 

 

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

 

59

Number of sectors transferred during a Read Multiple or

xxxxH

 

 

Write Multiple command

 

 

60–61

Total number of user-addressable sectors

ST9750423AS

= 0FFFFFFFh

 

This field contains a value that is one greater than the total

ST9750423ASG = 0FFFFFFFh

 

number of user-addressable sectors. The maximum value

ST9750422AS

= 0FFFFFFFh

 

that shall be placed in this field is 0FFFFFFFh. The

ST9750420AS

= 0FFFFFFFh

 

0FFFFFFFh value applies to all capacities over 137Gbytes

ST9750420ASG = 0FFFFFFFh

 

(see Section 3.2 and 3.3 for related information).

ST9640424AS

= 0FFFFFFFh

 

 

ST9640423AS

= 0FFFFFFFh

 

 

ST9640423ASG = 0FFFFFFFh

 

 

ST9500424AS

= 0FFFFFFFh

 

 

ST9500423AS

= 0FFFFFFFh

 

 

ST9500423ASG = 0FFFFFFFh

 

 

 

 

62

Retired

0000H

 

63

Multiword DMA active and modes supported

xx07H

 

 

(see note following this table)

 

 

64

Advanced PIO modes supported (modes 3 and 4 supported)

0003H

 

65

Minimum multiword DMA transfer cycle time per word

0078H

 

 

(120 ns)

 

 

66

Recommended multiword DMA transfer cycle time per word

0078H

 

 

(120 ns)

 

 

67

Minimum PIO cycle time without IORDY flow control (240 ns)

0078H

 

68

Minimum PIO cycle time with IORDY flow control (120 nsec)

0078H

 

69–74

ATA-reserved

0000H

 

75

Queue depth

001FH

 

76

Serial ATA capabilities

0506H

 

77

ATA-reserved

0000H

 

78

Serial ATA features supported

0048H

 

79

Serial ATA features enabled

0040H

 

80

Major version number

01F0H

 

81

Minor version number

0029H

 

82

Command sets supported

746BH

 

83

Command sets supported

7D09H

 

84

Command sets support extension

61E3H

 

85

Command sets enabled

7469H

 

86

Command sets enabled

BC09H

 

87

Command sets enable extension

61E3H

 

88

Ultra DMA support and current mode

xx7FH

 

 

(see note following this table)

 

 

Momentus Product Manual, Rev. C

27

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Seagate ST9750422AS, ST9750424AS, ST9750423ASG, ST9750420ASG, ST9640422AS, ST9640423ASG, ST9640424AS, ST9500423ASG XxxxH

ST9500428AS, ST9640422AS, ST9750423ASG, ST9750420AS, ST9750420ASG specifications

The Seagate ST9750422AS, ST9750423AS, ST9500423ASG, ST9640423ASG, and ST9500423AS are part of Seagate's popular lineup of SATA hard drives designed for consumer and enterprise applications. These drives are recognized for their reliability, performance, and advanced technologies, making them suitable for a variety of storage needs.

The ST9750422AS and ST9750423AS models are 7200 RPM drives with a storage capacity of 750 GB, while the ST9500423ASG and ST9640423ASG offer different capacities and characteristics tailored for specific uses. The ST9500423ASG typically features a 500 GB capacity, while the ST9640423ASG is often found with 640 GB of storage space. These drives support the Serial ATA interface, ensuring high-speed data transfer rates and compatibility with a broad range of host systems.

All drives in this series feature a robust 32 MB cache that enhances performance by allowing faster access to frequently used data. This cache is critical, especially for read/write operations that require rapid data retrieval, making these models well-suited for tasks ranging from simple home computing to more intensive applications such as gaming and multimedia editing.

The ST9750422AS and ST9750423AS models are built with technologies such as Advanced Format, which improves storage capacity and enhances error correction. Additionally, these drives employ Seagate's PowerBalance and PowerFin technologies, enabling efficient power management without compromising performance.

Reliability is a core characteristic of the Seagate ST9XXX series, featuring a mean time between failures (MTBF) of over a million hours, which translates to increased system uptime and reduced potential for data loss. The drives also include features such as Native Command Queuing (NCQ), which optimizes the processing of multiple read/write commands, further boosting performance during heavy workloads.

In conclusion, the Seagate ST9750422AS, ST9750423AS, ST9500423ASG, ST9640423ASG, and ST9500423AS hard drives represent a blend of speed, reliability, and advanced technology, making them an excellent choice for users looking for dependable storage solutions. Whether for a home PC or an enterprise server, these drives continue to deliver outstanding performance and value in a competitive market.