Travelstar 5K160 (SATA) Hard Disk Drive Specification

12.15Software Setting Preservation Feature Set

When a device is enumerated, software will configure the device using Set Features and other commands. These software settings are often preserved across software reset but not necessarily across hardware reset. In Parallel ATA, only commanded hardware resets can occur, thus legacy software only reprograms settings that are cleared for the particular type of reset it has issued. In Serial ATA, COMRESET is equivalent to hard reset and a non-commanded COMRESET may occur if there is an asynchronous loss of signal. Since COMRESET is equivalent to hardware reset, in the case of an asynchronous loss of signal some software settings may be lost without legacy software knowledge. In order to avoid losing important software settings without legacy driver knowledge, the software settings preservation ensures that the value of important software settings is maintained across a COMRESET. Software settings preservation may be enabled or disabled using Set Features with a subcommand code of 06h. Software settings preservation is enabled by default.

12.15.1Preserved software settings

If Software setting preservation is enabled, the following settings are preserved across COMRESET. Otherwise settings are cleared across COMRESET.

Setting

Contents

Initialize device parameters

Track length

 

 

 

Number of head

 

 

 

Number of cylinder

 

 

 

Capacity

Power Management Feature Set Standby Timer

Time to fall into standby mode

Security mode state

Security freeze lock

 

Security unlock

Set max address

Capacity

Set feature

Write Cache Enable/Disable

 

Set Transfer Mode

 

Advanced Power Management Enable/Disable

 

Read Look-Ahead

 

Reverting to Defaults

Set multiple mode

Block size

Figure 19 Preserved Software Setting

12.16Native Command Queuing

Native Command Queuing feature (Read / Write FPDMA Queued commands) is supported. Please refer to the Serial ATA II Specification about Native Command Queuing.

The host shall not issue a legacy ATA command while a native queued command is outstanding. Upon receiving a legacy ATA command while a native queued command is outstanding, the device aborts the command and halts command processing of outstanding native queued commands.

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Hitachi HTS541640J9SA00 Software Setting Preservation Feature Set, Native Command Queuing, Preserved software settings

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