HDD and SSD are both used for storing data ... SSDs are more expensive, especially as storage size increases. A 1TB SSD can ...

The sector is the smallest size of data that can be read or written ... Here is more information on HDD vs SSD. Data stored in sectors cannot be accessed in case of bad sectors on HDD.

Both allow for native performance that's on par with the Xbox Series X's very speedy internal SSD. Keep in mind that you cannot boot Xbox Series X games off of an external hard drive right now ...