Seagate Exos X20 SATA Product Manual, Rev. B
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www.seagate.com
About self-encrypting drives
4.0
About self-encrypting drives
Self-encrypting drives (SEDs) offer encryption and security services for the protection of stored data, commonly
known as “protection of data at rest.” These drives are compliant with the Trusted Computing Group (TCG) Enterprise
Storage Specifications as detailed in
The Trusted Computing Group (TCG) is an organization sponsored and operated by companies in the computer,
storage and digital communications industry. Seagate’s SED models comply with the standards published by the TCG.
To use the security features in the drive, the host must be capable of constructing and issuing the following two ATA
commands:
Trusted Send
Trusted Receive
These commands are used to convey the TCG protocol to and from the drive in their command payloads.
4.1
Data encryption
Encrypting drives use one inline encryption engine for each port, employing AES-256 bit data encryption keys with
AES-XTS mode to encrypt all data prior to being written on the media and to decrypt all data as it is read from the
media. The encryption engines are always in operation and cannot be disabled.
The 32-byte Data Encryption Key (DEK) is a random number which is generated by the drive, never leaves the drive,
and is inaccessible to the host system. The DEK is itself encrypted when it is stored on the media and when it is in
volatile temporary storage (DRAM) external to the encryption engine. A unique data encryption key is used for each of
the drive's possible16 data bands (see
).
4.2
Controlled access
The drive has two security providers (SPs) called the "Admin SP" and the "Locking SP." These act as gatekeepers to the
drive security services. Security-related commands will not be accepted unless they also supply the correct credentials
to prove the requester is authorized to perform the command.
4.2.1
Admin SP
The Admin SP allows the drive's owner to enable or disable firmware download operations (see
). Access
to the Admin SP is available using the SID (Secure ID) password or the MSID (Manufacturers Secure ID) password.
4.2.2
Locking SP
The Locking SP controls read/write access to the media and the cryptographic erase feature. Access to the Locking SP
is available using the BandMasterX or EraseMaster passwords. Since the drive owner can define up to 16 data bands
on the drive, each data band has its own password called BandMasterX where X is the number of the data band (0
through 15).
4.2.3
Default password
When the drive is shipped from the factory, all passwords are set to the value of MSID. This 32-byte random value can
only be read by the host electronically over the interface. After receipt of the drive, it is the responsibility of the owner
to use the default MSID password as the authority to change all other passwords to unique owner-specified values.
