Therefore, data won't be overwritten on SSDs. Existing data must be erased to write new data. Data on SSDs is read and written at the page level but is erased at the block level. Why? Keep reading.Įach NAND flash memory consists of several blocks and each block consists of around 128 pages. Due to this, the data on SSDs cannot be overwritten when new data is written in. How Do SSDs Store Data?Īs we know, SSDs store data relying on NAND flash memory. To better understand what SSD over-provisioning is, let’s first learn how data is stored and erased on SSDs. This post from MiniTool is tailored to detail what SSD over-provisioning is and explains why it is necessary. Many users have a basic knowledge of this kind of drive but the concept of SSD over-provisioning is still confusing. SSDs originated in the 1950s and now go mainstream.
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