Messages in this thread | | | From | Lutz Vieweg <> | Subject | Improving SD/SDHC/SDXC write performance by using a discard/TRIM like operation | Date | Mon, 04 Jun 2012 20:27:01 +0200 |
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When I read reports from (non-expert) users who claimed that they were able to restore the initial write performance of their SDXC cards by using a "special formatter tool" (while normal "formatting" did not improve performance), I was very sceptical, as I also had read that there is no way to discard/TRIM blocks on SD/SDHC/SDXC cards.
But then I noticed that this "special formatter" tool was actually offered (for free) by the SD Association: https://www.sdcard.org/downloads/formatter_3/ ... and its documentation clearly states that this tool is capable of using "flash erase" operations on SD cards, which are said to be different from ordinary "overwrites", see https://www.sdcard.org/downloads/formatter_3/SDFormatter_3.1e.pdf pages 7 ("Format type Erase" vs. "Format type Overwrite") and the screen shot on page 9.
Now I wonder: Is there really such a thing as a command to erase NAND flashes in SD cards like there is for SSDs? If so, it would certainly be a good thing to support it with Linux block discard...
Regards,
Lutz Vieweg
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