One embodiment provides a device, including a processor; a plurality of storage units operatively coupled to the processor; and a memory device that stores instructions executable by the processor to: determine a first storage unit from the plurality of storage units; select at least one second storage unit from among the remaining other storage units that comprises a parameter that satisfies a predetermined condition, the predetermined condition being related to the first storage unit; transfer data from at least one of the first and second storage units to at least one the remaining other first and second storage units; and delete data from said at least one of the first and second storage units from which the data was transferred. Other aspects are described and claimed.