As the data storage market demands faster, more energy efficient solutions in a smaller footprint, solid state drives (SSDs) offer the promise of higher performance, reduced power consumption, and reduced space requirements – with continuing improvements over time. In order to fulfill this potential, widely adopted industry standards for SSDs are seen as essential tools to reduce market confusion, facilitate broad adoption and alleviate product quality and reliability concerns.
About JESD218 and JESD219
To achieve the goal of consensus-based industry standards for SSDs, JEDEC’s JC-64.8 Subcommittee for Solid State Drives has taken the lead to provide meaningful, real-life, endurance and reliability metrics to better enable customers to select the right SSD for their expected applications and workloads. In September 2010 JEDEC announced the publication of two widely anticipated standards for solid state drives: JESD218 Solid-State Drive (SSD) Requirements and Endurance Test Method and JESD219 Solid-State Drive Endurance Workloads.
An update to JESD218 was published in February 2011, and is available for free download
. JESD219 was updated in July 2012, and JESD219A and its supporting trace files are also available for free download
JC-64.8 plans to continue work on additional SSD standards, and all interested companies are encouraged to join JEDEC and participate in the development effort.
For each class of SSDs defined in the standard, JESD218 Solid-State Drive Requirements and Endurance Test Method defines conditions of use and corresponding endurance verification requirements. As SSDs are subject to different levels of demand depending on the applications in use, the standard defines two application classes: Client and Enterprise. It further establishes specific requirements for each, an approach intended to help consumers and enterprise IT managers choose products that are the best fit for their needs.
Endurance Rating & Verification
JESD218 also creates an SSD Endurance Rating that represents the number of terabytes written by a host to the SSD (TBW), which provides a standard comparison for SSDs based on application class. A standard endurance rating will be a welcome change for end users seeking to compare SSDs from different manufacturers. In addition, the standard establishes two approaches – direct verification and extrapolation - for endurance and retention verification.
Since workloads are expected to change as applications evolve, they are described in a separate, complementary standard: JESD219 Solid-State Drive Endurance Workloads. Because the workload that a SSD is subjected to has a significant impact on the amount of data that may be written to the drive, a standard workload is required to have comparable results.