An apparatus having a memory circuit and a manager is disclosed. The memory circuit generally has (i) one or more Flash memories and (ii) a memory space that spans a plurality of memory addresses. The manager may be configured to (i) receive data items in a random order from one or more applications, (ii) write the data items in an active one of a plurality of regions in a memory circuit and (iii) mark the memory addresses in the active region that store the data items as used. Each data item generally has a respective host address. The applications may be executed in one or more computers. The memory addresses in the active region may be accessed in a sequential order while writing the data items to minimize a write amplification. The random order is generally preserved between the data items while writing in the active region.