Disk drive including sloped base and cover

A disk drive responsive to a host computer, comprising:

• a base, said base having a top and a bottom, and an actuator mounting point;
• a cover sealably attached to said top of said base to provide a controlled environment substantially isolated from ambient atmospheric pressures between said cover and said base, said cover having an inner surface and an outer surface;
• a spin motor mounted on said top of said base;
• a disk mounted on said spin motor in said controlled environment, said disk defining a plane spaced a first distance from said inner surface of said cover;
• at least one head for reading information from and writing information on said disk;
• an actuator arm pivotally mounted on said actuator mounting point, said actuator arm having a first end for supporting said at least one head and a second end disposed on the opposite side of said actuator mounting point from said first end, said first end of said actuator arm being spaced a second distance from said inner surface of said cover and said second end of said actuator arm being spaced a third distance from said inner surface of said cover, said second distance being smaller than said first distance and said third distance being greater than said first distance;
• magnet structure attached to said base and formed of a permeable material, said magnet structure comprising top and bottom plates and spacers for separating said top and bottom plates, said top plate being spaced a fourth distance from said inner surface of said cover, said fourth distance being greater than said second distance and equal to or greater than said first distance;
• magnetic means, supported by said magnet structure, for providing a magnetic field;
• a coil, supported by said second end of said actuator arm, for passing a current in the magnetic field;
• and
• control means, supported on the bottom of said base for generating control signals, and for providing information signals to and receiving information signals from said head.