Final answer:
The built-in erase commands on some SSDs are not completely effective because SSDs use NAND flash memory and wear-leveling, which may leave residual data after a standard erase procedure.
Step-by-step explanation:
The statement, 'The built-in erase commands are not completely effective on some SSDs', is true. Solid State Drives (SSDs) operate differently compared to traditional hard drives due to the way they store data using NAND flash memory. When data is erased on an SSD, it's not immediately removed but marked to be overwritten, which is why the erase commands may not be fully effective in making sure that the data cannot be recovered. Moreover, due to SSD's wear-leveling algorithms, data may reside in multiple cells, and erase commands may not clean all residual data, posing a challenge for complete data erasure. In contrast, traditional hard drives would overwrite the physical location of the data, making the data unrecoverable. This is why new methods and tools are often recommended for securely erasing data on SSDs.