In certain aspects, one or more solid-state storage devices (SSDs) are provided that include a controller and non-volatile memory coupled to the controller. The non-volatile memory can include one or more portions configured as main memory or cache memory. When data stored in the main memory is written to the cache memory for processing, the data in the main memory is erased. In certain aspects, storage systems are provided that include one or more of such SSDs coupled to a host system. In certain aspects, methods are provided that include: receiving, by a first such SSD, a first command to write data to memory; determining that the data is stored in a main memory and is to be written to the cache memory for processing; writing the data to the cache memory; and erasing the data from the main memory.