Seagate ST120FP0021 Seagate 600 Pro SSD Product Manual - Page 20

2.11 RELIABILITY 2.11.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF) The product shall achieve an Annualized Failure Rate - AFR - of 0.58%. AFR and MTBF are population statistics that are not relevant to individual units. AFR and MTBF specifications are based on the following assumptions: • 8760 power-on-hours per year. • 250 average power cycles per year. • Operations at nominal voltages. • Systems will provide adequate cooling to ensure the case temperatures do not exceed specification. 2.11.2 Reliability specifications Unrecoverable read error rate during Annualized Failure Rate (AFR) [5] Power cycles Warranty Preventive maintenance Typical Data Retention with Power removed (at 40°C) Endurance 1 LBA per 1016 bits read, max 0.58% 25,000 cycles (at nominal voltage and temperature, with 60 cycles per hour and a 50% duty cycle) Warranty terms will vary based on type of warranty chosen: "Managed Life" [3] or "Limited Warranty with Media Usage".[4] Consult your Seagate sales representative for warranty terms and conditions. None required. 3 months [1] Method 1: 2 Drive Writes per Day for 3 years at 28% OP [2] Method 2: TBW (per JEDEC JESD218) 400GB = 834TB 200GB = 417TB 100GB = 209TB [1] As NAND Flash devices age with use, the capability of the media to retain a programmed value begins to deteriorate. This deterioration is affected by the number of times a particular memory cell is programmed and subsequently erased. When a device is new, it has a powered off data retention capability of up to ten years. With use the retention capability of the device is reduced. Temperature also has an effect on how long a Flash component can retain its programmed value with power removed. At high temperature the retention capabilities of the device are reduced. Data retention is not an issue with power applied to the SSD. The SSD drive contains firmware and hardware features that can monitor and refresh memory cells when power is applied. [2] Endurance is the expected write life of a product when subjected to a specified workload. The drive will support the end user writing the specified multiple of drive user capacity to the drive per day for the expected life of the product. This value is based on randomly writing 4KB transfers aligned on 4KB boundaries across the entire drive LBA range. For example a 200GB drive could be written to up to (n*200GB) of user data per day for the product life. [3] Managed Life: This warranty is term based and includes the Lifetime Endurance Management feature stated in Section 2.4.1. [4] Limited Warranty with Media Usage provides coverage for the warranty period or until the estimated life indicator reaches 1 as reported by SMART attribute 231. [5] The AFR and MTBF specifications for the drive assumes the operating environment is designed to maintain nominal internal temperature. The rated AFR is based upon a sustained internal temperature of 60°C. Occasional excursions in operating temperature between the rated MTBF temperature and the maximum drive operating temperature may occur without impact to the rated MTBF temperature. However continual or sustained operation at temperatures beyond the rated MTBF temperature will degrade the drive MTBF and reduce product reliability SEAGATE 600 PRO SSD PRODUCT MANUAL, REV. B 16