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10.21.17 Customer Specific Requirements
This specification does not cover customer-specific requirements. Customer-specific requirements are submitted by
the customer to Western Digital in the form of a customer-specification document.
10.21.18 Switching between TCG Enterprise and ISE model
Note: This section covers certain capabilities of the new generation of Western Digital products that is not commonly
needed in typical use-cases.
The new generation of Western Digital products can function as a simple SED with Instant Secure Erase feature
support and also support TCG Enterprise SSC at the same time, right out of the box. The drives support the
SANITIZE command with CRYPTO ERASE option (for Instant Secure Erase) or the non-instant way of OVERWRITE
option to scrub/erase the drive. The drives also support TCG command interactions in accordance with the SIIS
specification.
In the factory default state, the drive can be used out of the box as a plain SED drive with Instant Secure Erase (ISE)
capability, while the drive also reports as TCG enabled/ready drive (thus allowing it to be recognized/detected as a
TCG capable device by any standards based RAID controllers for example).
The drive is said to be in ISE-mode of operation, until such time any of the TCG Settings/configurations are accessed
(on the LOCKING SP). Upon TCG LOCKING SP access (e.g.: Authenticating to BANDMASTER or ERASEMASTER
or a TCG-Activate command is issued (though TCG-Activate is not necessary)), the drive is said to be in TCG-mode
of operation.
The drive, though reports as TCG enabled/ready drive, will not enforce certain SIIS spec compliance unless the drive
is (implicitly) used as a TCG drive or put in TCG-mode.
10.21.18.1 ISE-mode and TCG-mode
As stated above, the factory default state of the drive is ISE-mode (which the drive also reports as TCG enabled/read
and responds to TCG commands and operations). If and when the drive is access as a TCG drive (by access
LOCKING SP), the drive automatically goes into TCG-mode and fully support SIIS specification (including
ReadLong/WriteLong behavior restrictions, and Western Digital unique Logical-Ports (e.g.: FW-Download port-
locking etc.)).
While there are ways to put the drive in its factory default state, the below list mechanism could be used to quickly
put the drive in factory default state.
To revert the drive back to factory default state from TCG-mode, perform TCG Revert operation (see TCG
commands section for details).
IMPORTANT NOTE: All the data on the drive will be lost.
10.21.19
Block SID Authentication
If a Block SID Authentication command has been successfully executed, SID Authentication will be blocked. This
feature based on TCG Storage Feature Set: Block SID Authentication Specification Version 1.00 Published Revision
1.00.
If Block SID Authentication is supported, Level 0 Discovery returns feature descriptor as Feature Code = 0402.
The Block SID Authentication command is delivered by the transport IF-SEND command. There is no IF-RECV
response to the Block SID Authentication command.
The Block SID Authentication command is defined as follows:
Command: IF_SENF
Protocol ID: 0x02
Transfer Length: Non-zero
ComID: 0x0005
Byte 0: Clear Events (0 or 1)
Bytes 1 to Transfer Length -1: Reserved (00)
Block SID Authentication state will be cleared by Power Cycle or Revert Method. If a Block SID Authentication
command issued with Clear Events = 1, Block SID Authentication state is also cleared by Hardware Reset.
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Hard Disk Drive Specification