Contec BX-320-DC700000, Руководство пользователя

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6. Appendix
BX-320 User’s manual
87
Life of CF
About write endurance
CFast contained in product has a write endurance which limits the number of times each memory may be
written, due to the characteristic of the memory that is used. Write endurance can be calculated by the
following formula as a reference value:
CFast (SLC)
Write endurance (days) =
((Total capacity (MB) / Management block size (MB)) × NAND Flash memory life span (cycles))
/ The number of management block to be rewrited per 1 cycle
Example1 (SLC):
When the file of 4MB is made for CFS-16GB-A, and it rewrites it once per 10 minutes.
Write endurance = ((14,595 / 4) × 60,000) /1 = 218,925,000 (cycles)
Life = 218,925,000 / ((60 / 10) × 60 × 24 × 365)
≈
69.4 (years)
CFast (MLC / Q-MLC)
Write endurance (days) =
((Total capacity (KB) / Management page size (KB)) × NAND Flash memory life span (cycles)
/ The number of management page to be rewritten per 1 cycle
Example2 (MLC):
When the file of 4MB is made for CFS-32GBM-A, and it rewrites it once per 10 minutes.
Write endurance = ((30,144,000 / 16) × 20,000) /250 = 150,720,000 (cycles)
Life = 150,720,000 / ((60 / 10) × 60 × 24 × 365)
≈
47.7 (years)
Example3 (Q-MLC):
When the file of 4MB is made for CFS-16GBQ-A, and it rewrites it once per 10 minutes.
Write endurance = ((150,072,000 / 16) × 20,000)/250 = 75,360,000 (cycles)
Life = 75,360,000 / ((60 / 10) × 60 × 24 × 365)
≈
24 (years)
Example4 (Q-MLC):
When the file of 4MB is made for CFS-32GBQ-B, and it rewrites it once per 10 minutes.
Write endurance = ((30,144,000 / 16) × 20,000)/250 = 150,720,000 (cycles)
Life = 150,720,000 / ((60 / 10) × 60 × 24 × 365)
≈
47.7 (years)
After all these are reference values, confirm its life span by the LiveMonitor
The details refer to the manual of the CFast card of the option product.
About LiveMonitor
* For more information, visit the CONTEC's Web site.