Definition of block level storage

Object vs. File vs. Block Storage: What’s the Difference? | IBM

DAS vs NAS vs SAN: Choosing the Right Storage Solution

SOLVED: Some file systems allow disk storage to be allocated at different levels of granularity. For instance, a file system could allocate 4 KB of disk space as a single 4-KB block or as eight 512-byte blocks. How could we take advantage of this flexibility to improve performance? What modifications would have to be made to the free-space management scheme in order to support this feature? | Numerade