SCT Command Transport feature Set | Hitachi HDS721032CLA662 instruction

9.18SCT Command Transport feature Set

9.18.1Overview

9.18.1.1Introduction

SMART Command Transport (SCT) is the method for the drive to receive commands using log page E0h and transporting data using log page E1h. These log pages are used as follows:

	Log page E0h	Log Page E1h
Write log page	Issue Command	Send Data to the drive
Read log page	Return Status	Received Data from the drive

Table 41 SCT Log Page and direction

There are two ways to access the log pages: using SMART READ/WRITE LOG and READ/WRITE LOG EXT. Both sets of commands access the same log pages and provide the same capabilities.

The log directory for log pages E0h and E1h should report a length of one. The length of log page E1h does not indicate the length of an SCT data transfer.

If SMART is supported, but not enabled, the drive supports SMART READ/WRITE LOG for Log page E0h and E1h.

If security is enabled and password has not been issued to unlock the device, all SCT commands will fail.

9.18.1.2Capability definition

Capability Identification is performed by issuing Identify Device command. Word 206 of Identify Data is used to determine if SCT is enabled and which SCT Action Codes are supported.

Word		Description
206	SCT Command set support
	15-12	Vendor Specific
	11-6	Reserved
	5	Action Code 5 (SCT Data Table) supported
	4	Action Code 4 (Features Control) supported
	3	Action Code 3 (Error Recovery Control) supported
	2	Action Code 2 (SCT Write Same) supported
	1	Obsolete
	0	SCT Feature Set supported (includes SCT status)

Table 42 Identify Device Information Word 206

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