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The drives firmware should take care of moving the data around when needed.
Chkdsk should tell you if any files are corrupted.
Look at how old this thread is. 22nm nand has been around for a while now and I haven't heard of this being an issue for anyone in real world usage.
As long as the drive isn't totally worn, data retention should still be a year when powered off. But that's at end of life. When the drive is new, data should last for years without power.
In short, even at 2xnm it's not an issue. Not saying it won't be in the future, but the JEDEC standard is pretty clear on the issue.
The actual data retention time of a flash memory will depend upon many factors: the quality of the Nand flash, the number of program/erase cycles, the rate at which these program/erase cycles occured, the temperature at which the Nand flash will be stored at, etc. Depending upon these factors, the data retention may exceed 10 years or be far less.
So would I. Anandtech has an article on the degradation of data, but there is no follow up article, I couldn't help but wonder if intel pay him off and ask him to stop writing those articles
and I found it impossible to believe that no1 talks about this as so many of us buying and using SSD. How can we use a technology if we don't know it is safe to use? That the data can disappear?
Intel and others, AFAIK, use a method of refreshing long term static data periodically. If the drive hasn't accessed a particular page in a while, Intel says they refresh the data on occasion.