A balancing weight, a disc pack of a hard disc drive with the balancing weight, and a method for balancing the disc pack are provided to prevent a pollutant from being generated inside the hard disc drive and to cut down manufacturing cost of the hard disc drive. A balancing weight(100) includes an insertion unit and a fixing unit. The insertion unit is inserted into an opened screw hole(85-C) of a disc pack, which consists of a screw hole(86a) of a spindle motor(80) arranged mutually and a screw hole(86b) of a disc clamp(82). The fixing unit is connected to the insertion unit to prevent separation from the screw hole. The insertion unit includes a cylindrical shaft whose diameter is suitable to be inserted into the opened screw hole of the disc pack. The fixing unit has a compressible latch which is compressed when passing through the screw hole of the disc clamp and expanded after passing, to prevent the balancing weight from being separated from the disc clamp. A method for balancing the disc pack by using the balancing weight includes a step of analyzing balance of the disc pack; and a step of preventing the balancing weight from being separated from the disc pack by inserting the balancing weight into the opened screw hole of the disc pack when requesting the disc pack to be balanced.
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