This read-create StorageType value records how the configuration row for this STM1-4-ET card entry is persisted, such as volatile or non-volatile storage, per the standard SNMP conceptual-row model. It matters to an administrator because it determines whether the STM1-4-ET card's row survives a device reboot or has to be recreated afterward. For example, a technician who provisions this STM1-4-ET card entry with non-volatile storage can expect the settings to still be there after the next power cycle, unlike a volatile entry that would need to be redone.