The Internal Mechanism Of an SSD

• SSDs supply an interface of writing in pages - hiding the "full block erasure" nature of NAND-FLASH.
• To achieve more capacity - an SSD may contain several FLASH chips.
• This will allow faster access as well (striping data across the FLASH chips).
• To make the writes faster, it uses dynamic mapping:
  • If we write to the same cell again:
  • The data is written to a different block
  • and the LBA (Logical Block Address) is mapped to the new location.
• This technique is known as LSA - Log-Structured Array.
• This mapping is also used to handle wear leveling - see below...
• SSDs often employ standard disk interfaces (e.g. SATA, SAS).

Originally written by guy keren