Identical data is written to multiple nonvolatile memory chips connected to a memory bus by sending address information to a first nonvolatile memory chip and a second nonvolatile memory chip, selecting the first and second nonvolatile memory chips, while the first nonvolatile and second nonvolatile memory chips are both selected, sending user data over the memory bus to the first and second nonvolatile memory chips in parallel, and programming the user data in the first nonvolatile memory chip and the second nonvolatile memory chip in parallel.