What is the difference between Samsung series NAND flash?

     K9F The series is SLC Structured Samsung series NAND Flash 2.K9G The series is MCL Structural NAND Flash

　 The first is the number of accesses .MLC Theoretically, architecture can only bear about 1 Ten thousand data writes , and SLC The architecture can withstand about 10 Ten thousand times , yes MLC Of 10 times . This 1 Ten thousand times refers to the number of data writes , Instead of the total number of data writes and reads . The number of data read times has a certain impact on the life of flash memory , But it is not as serious as writing .

　 The second is the reading and writing speed . There are still misunderstandings in understanding , All flash chips read 、 Writing or erasing data is done under the flash memory control chip , The speed of flash memory control chip determines the reading of data in flash memory 、 The speed of erasure or rewriting .SLC Technology was developed long before MLC technology , The matching control chip technology has been very mature .

　 The third is power consumption .SLC Architecture due to every Cell Store only 1bit data , So there are only high and low 2 Two level states , Use 1.8V Voltage can drive .

　 and MLC Architecture every Cell Need to store multiple bit, That is, the level should be divided into at least 4 files （ Deposit 2bit）, So there needs to be 3.3V And above voltage can drive . The fourth is the error rate . In one reading and writing SLC Only 0 or 1 Two kinds of state , This technology can provide fast programming and reading , Simply put, every Cell Just like the switch used in our daily life , There are only two states: on and off , Very stable , Even one of them Cell damage , It will not affect the overall performance .

　 In one reading and writing MLC There are four states （ per Cell access 2bit For example ）, That means MLC During storage, the charging voltage of each storage unit should be controlled more accurately , When reading and writing, it needs longer charging time to ensure the reliability of data .

　 It is no longer a simple switching circuit , But to control four different states , This has great requirements in terms of product error rate and stability , And once something goes wrong , It will lead to 2 Times or more data corruption , therefore MLC There are higher requirements for manufacturing process and control chip .

The fifth is the manufacturing cost .MLC Technology used to be every Cell Store only 1bit data , And now every Cell Can be stored 2bit Even more data , These are achieved on the premise that the storage volume does not increase , So the same capacity MLC NAND Flash The manufacturing cost is much lower than SLC NAND Flash.

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