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11.6
Cryptographic erase
A significant feature of SED drives s is the ability to perform a cryptographic erase. This involves the host telling the
drive to change the data encryption key for a particular band. Once changed, the data is no longer recoverable since it
was written with one key and will be read using a different key. Since the drive overwrites the old key with the new
one, and keeps no history of key changes, the user data can never be recovered. This creates an instantaneous data
erase and is very useful if the drive is to be scrapped or redispositioned. Erased sectors are unmapped and return all
zeros if read.
11.7
Authenticated firmware download
In addition to providing a locking mechanism to prevent unwanted firmware download attempts, the drive also only
accepts download files which have been cryptographically signed by the appropriate Seagate Design Center.
Three conditions must be met before the drive will allow the download operation:
1.
The download must be an SED file. A standard (base) drive (non-SED) file will be rejected.
2.
The download file must be digitally signed and authenticated.
3.
As with a non-SED drive, the download file must pass the acceptance criteria for the drive. For example it must be
applicable to the correct drive model, and have compatible revision and customer status.
11.8
Power requirements
The standard drive models and the SED drive models have identical hardware, however the security and encryption
portion of the drive controller ASIC is enabled and functional in the SED models. This represents a small additional
drain on the 12V supply of about 150mW in power consumption. See the tables in
model and capacity
Seagate Nytro 5050 NVMe SSD Product Manual, Rev C
for power requirements on the standard (non-SED) drive models.
Table 9.2.2, Power consumption by
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