Advanced Device Security Features; Secure Erase; Physical Presence Sid; Sanitize - Seagate Nytro 4350 NVMe Product Manual

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6.2

Advanced Device Security Features

6.2.1

Secure Erase

Secure Erase is a standard NVMe format command and it writes all of "0x00" to fully wipe all the data on hard drives
and SSDs. When this command issues, the SSD controller erases its storage blocks and returns to its factory default
settings.
6.2.2

Physical Presence SID

TCG defines Physical Presence SID (PSID) as a 32-character string. PSID reverses the SSD to its manufacturing setting
when the SSD is set through TCG Pyrite (non-SED). The PSID code is printed on the SSD label. PSID erases all data when
reverting the SSD to manufacturing settings.
6.2.3

Sanitize

The Sanitize feature uses the Format NVM command to provide an alternative to the existing secure erase capabilities.
This feature provides robust data security by making sure the user data from the SSD media, caches, and the
Controller Memory Buffer are erased by the block erase operations, overwriting or destroying the encryption key. The
following table shows the types of Sanitize Operations supported.
Table 14 Sanitize Operations
SSD Security Type
Non-SED (TCG Pyrite)
NOTE
6.3

SSD Lifetime Management

Drive Writes per Day (DWPD) The Total Bytes Written (TBW) specification of an SSD calculates how many times you
can write the user capacity of an SSD per day over the warranty period (or a different number of years), based on the
JEDEC workload used to specify the TBW.
DWPD = (TBW of an SSD x 1024) / (Warranty days x SSD size in GB)
TBW measures the lifespan of the SSD. This measurement represents the amount of data written to the device. To
calculate the TBW of an SSD, use the following equation:
TBW = [(NAND Endurance) x (SSD Capacity)] / [WAF]
NAND Endurance: NAND endurance refers to the P/E (Program/Erase) cycle of a NAND flash.
SSD Capacity: The SSD capacity is the specific capacity in total of an SSD.
Seagate Nytro 4350 NVMe SSD Product Manual, Rev A
Sanitize Operation
Overwrite Block Erase
Yes Yes
Sanitize Overwrite command erases all data on the disk beyond all feasible
effort to recover. Completion takes at least one hour per terabyte per pass. The
number of passes is drive-selectable. The NVMe spec default is 16 passes.
Contact Seagate Support for more detailed information.
TCG Commands
Crypto PSID Revert
Erase Process
No Yes
Instant Security
Erase
No
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