Msid; Logging; Number Of Sessions; Number Of Bands - HGST HUS724040ALS640 Manual

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 pass-
word. 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.
HGST 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".

21.9 Logging

HGST logging functions will not record any sensitive data such as customer plain text data, passwords, encryption keys or
wrapping keys.
.

21.10 Number of Sessions

The HGST 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.

21.11 Number of Bands

The Enterprise SSC specification calls for support of up to 1024 bands. The HGST implementation supports a maximum of 64
bands.

21.12 Number of COMIDs

The HGST Enterprise SSC implementation supports 2 COMIDs, the minimum requirement in the Enterprise SSC specifica-
tion. Only 1 comid can be in use at any time.

21.13 Locked and Unlocked Behavior

21.13.1 T10 SCSI commands

The table below describes how basic T10 SCSI commands behave on encryption drives in the locked and unlocked states.
HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
322