INTERFACECOMMANDS

S.M.A.R.T. Command Set

Execute S.M.A.R.T.

The Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) command has been implemented to improve the data integrity and data availability of hard disk drives. In some cases, a S.M.A.R.T. capable device will predict an impending failure with sufficient time to allow users to backup their data and replace the drive before data loss or loss of service.

The S.M.A.R.T. sub-commands (listed below) comprise the ATA S.M.A.R.T. feature set that provide access to S.M.A.R.T. attribute values, attribute thresholds and other logging and reporting information.

Prior to writing a S.M.A.R.T. command to the device’s command register, key values must be written by the host into the device’s Cylinder Low and Cylinder High registers, or the command will be aborted. For any S.M.A.R.T. sub-command, if a device register is not specified as being written with a value by the host, then the value in that register is undefined and will be ignored by the device. The key values are:

Key

Register

4Fh

Cylinder Low (1F4h)

C2h

Cylinder High (1F5h)

The S.M.A.R.T. sub-commands use a single command code (B0h) and are differentiated from one another by the value placed in the Features register. In order to issue a command, the host must write the sub- command-specific code to the device’s Features register before writing the command code to the command register. The sub-commands and their respective codes are:

D0h

S.M.A.R.T. Read Attribute Value

 

This feature returns 512 bytes of attribute information to the host.

D1h

S.M.A.R.T. Read Attribute Thresholds

 

This feature returns 512 bytes of warranty failure thresholds to the host.

D2h

Enable/Disable Autosave

 

To enable this feature, set the sector count register to F1h (enable) or 0 (disable). Attribute values are

 

automatically saved to non-volatile storage on the device after five minutes of idle time and before

 

entering idle, sleep or standby modes. This feature is defaulted to “enabled” when S.M.A.R.T. is

 

enabled via the S.M.A.R.T. Enable Operations commands. The autosave feature will not impact host

 

system performance and does not need to be disabled.

D3h

S.M.A.R.T. Save Attribute Value

 

This feature saves the current attribute values to non-volatile storage.

D4h

Perform Off-Line Data Collection

 

Data is collected from random seeks, timed pattern seek times and head margin tests.

D8h

Enable S.M.A.R.T.

D9h

Disable S.M.A.R.T.

DAh

S.M.A.R.T. Return Status

 

This feature allows the host to assess the status of a S.M.A.R.T. capable device by comparing all saved

 

attribute values with their corresponding warranty failure thresholds. If no thresholds are exceeded, the

 

drive is declared to have a positive health status. If any warranty failure threshold is exceeded, the drive

 

is declared to have a negative health status. Executing this sub-command results in all attribute values

 

being saved to non-volatile storage on the device.

DBh

Enable/Disable Automatic Off-Line

 

To enable this feature, set the Sector Count register to F1h or 0 to disable.

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Maxtor 92049U6, 91024U3, 90683U2, 91366U4, 91707U5, 92732U8 manual A.R.T. Command Set, Execute S.M.A.R.T
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91024U3, 92049U6, 90683U2, 91707U5, 92732U8 specifications

The Maxtor series of hard drives, specifically the models 91366U4, 92732U8, 91707U5, 90683U2, and 92049U6, exemplify the evolution of storage technology during the late 1990s and early 2000s, pivotal in shaping contemporary data storage solutions. These hard drives are recognized for their reliability, performance, and impressive capacities for their time.

The Maxtor 91366U4 features a storage capacity of 13.6 GB, delivering a spindle speed of 5,400 RPM. Its UATA interface allows for a fast data transfer rate, which was notable in its category. The model incorporates Advanced Power Management, contributing to lower power consumption and reduced heat generation, making it an appealing choice for system builders looking to enhance system longevity.

Moving on to the Maxtor 92732U8, this model increased capacity to 27.3 GB, aligning with the growing demand for more storage from users and businesses alike. This drive maintained a 5,400 RPM spindle speed while improving the access times, which aided in speeding up file retrieval processes. Noteworthy is its Plug and Play capability, which simplified installation and compatibility across various systems.

The Maxtor 91707U5 brought forward advancements in data integrity with the inclusion of features such as error correction codes. With a storage size of 17.3 GB and similar operational speeds, this model catered to users seeking reliable data management. Its robust build aimed to protect against accidents and environmental factors, ensuring data was safe while providing consistent performance.

The Maxtor 90683U2, with its 68.3 GB capacity, is particularly recognized for its reliability in desktop applications. The drive integrates a combination of Unidirectional Technology, driving advancements in read/write capabilities, and extensive shock protection, making it an ideal candidate for users with intensive data processing requirements.

Lastly, the Maxtor 92049U6 is known for its balanced blend of performance and functionality. Holding a capacity of 49.1 GB and retaining the sophisticated features of its predecessors, this model enabled faster data access and storage capabilities that met the needs of both home and professional users.

Together, these Maxtor hard drives embody the technological strides in the evolution of data storage—offering capacities and performances that set a standard in the industry and laid the groundwork for future storage solutions. The combination of innovative technologies and practical features made these drives highly sought after during their respective periods, and their legacy continues to influence modern data storage products.
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