MLC's 3000P/E and TLC's 1000P/E, these familiar SSD parameters, are key indicators of hard drive life.
In addition to the innate conditions of particle types, mastering with excellent algorithms plays a crucial role in improving the life of SSDs.
The secret weapon of durability improvement - ECC error correction
SSDs may have transmission errors due to flash wear, transmission signal changes, etc. Therefore, SSDs extremely need the master to have ECC corrections to correct these errors and avoid normal use due to errors.
However, the master error correction capability is limited. When random errors occur beyond the scope of ECC error correction, it will have a negative impact on normal use and durability.
For example, the master has 12-bit error correction capability, and the flash requires only 8 bits of ECC in the initial stage. However, as the flash memory wears out, the required number of ECC bits increases to 13 bits, which is beyond the scope of the master's repair capability. When the system reads and writes to this area, it may cause downtime due to an uncorrectable error.
To put it another way, if the flash memory is in the case of 12bit ECC, the number of P/E times can reach 1000. When the master supports 20bit ECC, the flash memory can have a higher P/E times, that is, have a higher lifetime.
What are the ECC error correction techniques?
Early master control has a low fault tolerance
Early master control mostly focused on BCH error correction, but with the continuous optimization of the main control, more advanced LDPC error correction gradually became the mainstream. LDPC can refer to the flash P/E from 1000 to 1500, so that the SSD durability can be improved by 50% without replacing the NAND flash.
The ECC error correction method using LDPC comes at the cost of price increase. After all, the more powerful ECC mechanism requires higher power consumption and more complex architecture design.
Taking the latest master control of Huirong Technology as an example, the LDPC ECC mechanism has been supported.
Minghao solid-state hard disk, adhere to the use of stable and reliable Huirong program, new products are equipped with LDPC ECC, SSD life has been improved to varying degrees. In the future, with the emergence of better ECC, the performance and longevity of SSD will continue to increase, and low-cost, durable and large-capacity SSDs are just around the corner!
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