I was under the following impressions: 1. Writable Unit: The smallest unit you can write to in an SSD is a page. 2. Erasable Unit: The smallest unit you can e

I was under the following impressions: 1. Writable Unit: The smallest unit you can write to in an SSD is a page. 2. Erasable Unit: The smallest unit you can erase in an SSD is a block, which consists of multiple pages. So if a write operation impacts only 1 byte within a page, the SSD cannot erase just that byte. However, it does not need to erase the entire block either. The SSD can perform a "read-modify-write" type of operation: - Read the full page containing the byte that needs to change into the SSD's cache buffer. - Modify just the byte that needs updating in the page cache. - Erase a new empty block. - Write the modified page from cache to the new block. - Update the FTL mapping tables to point to the updated page in the new block. So, a page does need to be rewritten even if just 1 byte changes. Whole-block erasure is avoided until many pages within it need to be modified.