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We present FEMU, a QEMU-based flash emulator for fostering future full-stack software/hardware SSD research, with the following four "CASE" benefits. FEMU is cheap ($0) as it will be an open-sourced software; FEMU is relatively accurate, with only 0.5-38% variance from OpenChannel SSD in our tests; FEMU is scalable, upon our optimized QEMU stack, to support up to 32 parallel channels/chips without unintended queueing delays; FEMU is extensible, enabling various types of SSD research, such as internal-SSD, kernel-only and split-level research on it.