NAND flash memory limited write durability is the technical defects, second only to the technology high unit capacity cost. Think SSD (solid state drive) will be 10000 times write/erase cycle failure ideas to storage administrators fall from grace. Now, according to the IEEE 's Spectrum of an article, Taiwan prosperous macro electronic engineers have found a way to let the usb flash disk write/erase cycle times extended to more than 100 million times.
Popular macro electronic group revealed how to utilize the heat to repair the flash memory chip insulating layer, the flash memory chip in each layer will erase operations degenerates. Researchers have know that this method is effective; Previous attempts to the whole chip heated to 250 degrees Celsius (482 degrees Fahrenheit) and last for several hours. Popular macro electronic further use their original phase change memory to the construction of the building materials the iota of heater, will flash page group heated to 500 degrees Celsius. Popular macro electronic also found that after heating temperature accelerated erase, it turned out to be material scientists unexpected. (in your attempt to pizza oven to restore the old SSD or CF card before, remember your vendors to say with you in SSD components about 185 Celsius when melting)
The technology of course can be some people want to used in TLC (three units) or even QLC (four units, each unit storage 4 bit flash) through the SSD built-in heater in the flash memory chip fifty times or 100 times write/erase cycle reset durability. However, I don't think the flash priority write durability is a big problem. In fact, our management process need to pay attention to is the wastage of the SSD.
Many people think that the SSD just can work and can not work, 10000 times write/erase cycle as a failure of the hard disk drive. This is not true. SSD sometimes also can chance without warning fault (like other storage media), and the failure happened not because write durability to the limit.
Each of the SSD flash memory controller will watch every page integration.it frequency, and as far as possible, will loss average distribution within the flash. Array controller and the host operating system can use SMART (from monitoring, analysis and reporting technology) to check the rest of the life cycle of SSD, and at the same time, report to the rest of the rated life SSD rate. If the customer accept, the array manufacturers will stop using expensive SLC (single unit) - although the SSD SSD write speed - and then started to use MLC usb flash disk, the usb flash disk life can achieve five years. MLC flash will meet array manufacturers about 80% to the needs of customers, other need SLC customers can in the old SSD will reach rated life cycle end sixty days before new SSD insert system.
Of course, within the SSD flash will not reach 10000 one erasing times after the self destruction, controller manufacturers will at least allow manufacturers in SSD to erase limit after equipment switch to read-only mode. 10000 times cycle only usb flash disk manufacturer can guarantee the normal work of the flash memory chip can point. Although the usb flash disk insulating layer degradation, affected the flash unit no longer able to correctly load data. In 10000 times cycle -- no one knows what is 10000 times or 30000 times in a given page - will have too much damaged unit that controller can't correct, and the controller will mark out the page is damaged. If too many pages damaged, SSD will not have any space to write new data. But this process is progressive, monitoring, and not with data loss fatal fault.
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