M.2 2280 Industrial PCIe SSD

401-0578-00 Rev. A

© 2022 | Delkin Devices Inc.

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provide different levels of throttling to achieve protection efficiently and proactively via SMART

reading.

1.4.

Advanced Device Security Features

1.4.1. Secure Erase

Secure Erase is a standard NVME format command and will write “0xFF” to fully wipe all the data

on hard drives and SSDs. When this command is issued, the SSD controller will erase its storage

blocks and return to its factory default settings.

1.5.

SSD Lifetime Management

1.5.1. Terabytes Written (TBW)

TBW (Terabytes Written) is a measurement of SSDs’ expected lifespan, which represents the

amount of data written to the device. To calculate the TBW of a SSD, the following equation is applied:

TBW = [(NAND Endurance) x (SSD Capacity) x (WLE)] / WAF

NAND Endurance: NAND endurance refers to the P/E (Program/Erase) cycle rating of NAND flash,

per the manufacturer’s specification.

SSD Capacity: The SSD capacity is the specific capacity in total of a SSD.

WLE: Wear Leveling Efficiency (WLE) represents the ratio of the average amount of erases on all

the blocks to the erases on any block at maximum.

WAF: Write Amplification Factor (WAF) is a numerical value representing the ratio between the

amount of data that a SSD controller writes to the flash and the amount of data that the host’s

flash controller writes. A better WAF, which is near 1, guarantees better endurance and lower

frequency of data written to flash memory.