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9.21.8
MSID
The MSID is set for each drive at the time of manufacturing to the serial number concatenated 4 times, to create a 32
byte password. Thus, as an example, if the serial number of a drive is abcd1234, the MSID would then be set to
abcd1234abcd1234abcd1234abcd1234. In TCG use cases such as "erase" or "repurpose", this will be the MSID
that is restored to the drive.
WDC serial numbers are unique and are generated according to the following general rules:
Maximum length of the serial number is 8 characters
Serial numbers do not contain the characters "I" or "O".M
9.21.9
Logging
WDC logging functions will not record any sensitive data such as customer plain text data, passwords, encryption
keys or wrapping keys.
9.21.10 Number of Sessions
The WDC implementation supports 1 active session at a time. In the case when a session is active and a new
session is requested, the drive answers the host with SP_BUSY. This covers the following 2 scenarios.
If an SP is in session and an attempt is made to start a second session with the same SP.
If an SP is in session and an attempt is made to start a second session with a different SP.
9.21.11 Number of Bands
The Enterprise SSC specification calls for support of up to 1023 bands. The WDC implementation supports a
maximum of 15 bands (not including Band 0).
9.21.12 Number of COMIDs
The WDC Enterprise SSC implementation supports 2 COMIDs, the minimum requirement in the Enterprise SSC
specification. Only 1 COMID can be in use at any time.
9.21.13 PSID
All WDC hard disk drives include a PSID number (and a machine-readable barcode encoding of the same) on the
product label. The PSID number is used to provide evidence of physical presence when required by the product's
security protocols (such as for the TCG-Revert operation), and is included on all WDC drives to enhance the
product's security.
Western Digital Hard Disk Drive OEM Specification
108
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