Although best for NAND devices, ETFS also supports other types of embedded storage media through the use of driver classes as follows:
| Class | CRC | ECC | Wear-leveling erase | Wear-leveling read | Cluster size |
|---|---|---|---|---|---|
| NAND 512+16 | Yes | Yes | Yes | Yes | 1K |
| NAND 2048+64 | Yes | Yes | Yes | Yes | 2K |
| RAM | No | No | No | No | 1K |
| SRAM | Yes | No | No | No | 1K |
| NOR | Yes | No | Yes | No | 1K |