What is the smallest transfer rate for a 3243 device?
CREATE TABLE "sigma_mass_storage_devices" (
  "device" real,
  "device_type" text,
  "capacity_mb" text,
  "avg_seek_time_ms" text,
  "avg_rotational_delay_ms" real,
  "avg_transfer_rate_k_b_s" real
);
SELECT MIN("avg_transfer_rate_k_b_s") FROM "sigma_mass_storage_devices" WHERE "device"=3243;