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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
Section
2.15.
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
Section
4.5).
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
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.
Seagate Enterprise Capacity 3.5 HDD v7 SATA Product Manual, Rev. B
Section
4.4). Access to the Admin SP
23
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