5.3 Host Commands
(30) SET FEATURES (X’EF’)
The host system issues the SET FEATURES command to set parameters in the Features field for the purpose of changing the device features to be executed.
Upon receipt of this command, the device sets the parameters in the Features field, then reports the status to the host system.
If the value in the Features field is not supported or it is invalid, the device posts an ABORTED COMMAND error.
Table 5.25 lists the available values and operational modes that may be set in the Features field.
Table 5.25 Features field values and settable modes (1/2)
Features | Drive operation mode |
|
Field |
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X ' 02 ' | Enables the write cache function. |
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X ' 03 ' | Set the data transfer mode. | *1 |
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X ' 04 ' | Enables the automatic reassign. (Note) |
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X ' 05 ' | Enables the advanced power management function. | *2 |
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X ' 06 ' | Enables the |
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X ' 07 ' | Spin up the |
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X ' 10 ' | Enables the Serial ATA function. | *3 |
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X ' 33 ' | Undefined (Note) |
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X ' 42 ' | Enables the Acoustic management function. | *4 |
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X ' 54 ' | Undefined (Note) |
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X ' 55 ' | Disables the read cache function. |
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| |
X ' 66 ' | Disables the reverting to | |
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X ' 77 ' | Undefined (Note) |
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X ' 81 ' | Prohibit the |
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X ' 82 ' | Disables the write cache function. |
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X ' 84 ' | Enables the automatic shift. (Note) |
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X ' 85 ' | Set the advanced power management mode to |
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X ' 86’ | Prohibit the |
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X ' 88’ | Undefined (Note) |
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X ' 90’ | Disables the Serial ATA function. |
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