Supplementary disk-enclosure cover configured to shield a hard-disk drive against electromagnetic interference

A disk enclosure configured to shield a hard-disk drive against electromagnetic interference, said disk enclosure comprising:

• a disk-enclosure base, comprising:
• a bottom;
• and
• sides attached to said bottom in a boxlike configuration;
• a disk-enclosure cover;
• and
• a supplementary disk-enclosure cover comprising:
• a top having an outer perimeter and an inner perimeter, said outer perimeter about parallel to said inner perimeter, said top disposed between said outer perimeter and said inner perimeter and having a flattened annular shape;
• and
• vertical flanges attached to and extending down from said outer perimeter of said top at about right angles to said top;
• wherein said vertical flanges are configured to cover respective gaps between a disk-enclosure cover and a disk-enclosure base to which said disk-enclosure cover is attached.

A hard-disk drive shielded against electromagnetic interference, comprising:

• a disk enclosure comprising:
• a disk-enclosure base, comprising:
• a bottom;
• and
• sides of said disk-enclosure base attached to said bottom in a boxlike configuration;
• a disk-enclosure cover;
• and
• a supplementary disk-enclosure cover comprising:
• a top having an outer perimeter and an inner perimeter, said outer perimeter about parallel to said inner perimeter, said top disposed between said outer perimeter and said inner perimeter and having a flattened annular shape;
• and
• vertical flanges attached to and extending down from said outer perimeter of said top at about right angles to said top;
• wherein said vertical flanges are configured to cover respective gaps between a disk-enclosure cover and a disk-enclosure base to which said disk-enclosure cover is attached;
• a spindle motor mounted in said disk-enclosure base;
• a spindle coupled to said spindle motor;
• at least one magnetic-recording disk rotatably mounted on said spindle;
• and
• at least one magnetic-recording head disposed to read data from, and to write data to, said magnetic-recording disk;
• wherein said disk enclosure is configured to shield an interior space enclosed by said disk enclosure against electromagnetic interference.