| 摘要 |
A disc drive, includes a base, a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. The actuator assembly also includes a bearing housing, head mounting arms, head suspensions attached to the head mounting arms and a head assembly attached to the head suspension. The disc drive also includes a hub having a cylindrical body. The hub includes a disc mounting flange on one end of the hub. A disc has an opening therein sufficient to allow the hub to fit within the opening of the disc. The disc has two substantially flat data surfaces. The disc also includes a disc clamping portion located near the opening in the disc. A clamp is used to attach the disc to the hub. At least one disc is placed onto the hub and onto the mounting flange of the hub. The clamp is then used to clamp the disc to the hub. The disc clamping portion includes features for accommodating differences in flatness between the disc surfaces, the mounting flange of the hub and the clamp. The features include a first raised feature which extends above the first data surface of the disc, and a second raised feature which extends above the second data surface of the disc. The features are either bumps or annular rings positioned on the disc mounting surface. The bumps or rings may be formed using a laser. The ring may also include a multiplicity of individual bumps. As the disc is clamped to the hub, the raised feature deforms to accommodate the mismatch in flatness between the disc surfaces, the mounting flange of the hub, and the clamp. The clamp may include a roughened disc clamping surface. The upper surface of the disc mounting flange may also be roughened.
|
