PROBLEM TO BE SOLVED: To bear fragility, a weak impact property, etc., and to prevent strain due to compression force by providing a slider suspension assembly having a laminated load beam attaching a reinforcement member. SOLUTION: This magnetic disk data storage system contains the slider suspension assembly used for a slider 30 of a pico-size and a nano-size for a data disk file. This assembly contains the laminated load beam 20 provided with plural layers and applied so as to attach the slider 30 to one end of a side opposite to a file actuator support part. This laminated load beam 20 is provided with at least a conductor, and is provided with an electric lead wire for connecting to the slider 30. The reinforcement member 13 reinforcing the assembly is attached to the laminated load beam 20. This reinforcement member 13 is formed to a required shape by a stamping process.