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flash memory or sd cards

(4 posts)
  • Started 5 years ago by telltommy
  • Latest reply from ScottW
  • Topic Viewed 923 times

telltommy
Posts: 17

Does one last longer than the other? do they die after a certain amount of writes?

Posted 5 years ago
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jd2066
Posts: 3814

Actully SD is a type of Flash Memory card.
I'm not sure how long Flash Memory lasts.

Posted 5 years ago
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raphoenix
Posts: 14920

telltommy,

Old white paper concerning memory wear leveling and life expectancy.
Probably has improved over the past years.
http://www.sandisk.com/Assets/.....elv1.0.pdf

Kindest Regards,
Rick P.♦:)

Posted 5 years ago
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ScottW
Posts: 6609

telltommy, that's a good question and there seem to be lots of different answers out there on the 'net. It's not the writes that kill flash, it's the erase cycles. Of course, in order to write new data or modify the old, you have to erase first so it might as well be the same.

Flash memory "endurance", as it's called, varies widely. Inexpensive flash drives can have an endurance as low as 10,000 erase cycles up to around 100,000. See this article from Imation and a page from Kingston about their flash drives endurance ratings:
http://www.imation.com/didyouk....._with.html
http://www.kingston.com/ukroot.....urance.asp

As Solid State Drives (SSD) start coming on the market, these endurance numbers need to be pushed higher -- up to 1 or 2 million and higher. Wear leveling is a technique to spread the erase cycles around the memory cells so they all wear out at roughly the same rate. This technology is still being advanced. Try googling on keywords such as "flash endurance", "wear leveling", and so on to read more.

Posted 5 years ago
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