Flanged cover for a low profile magnetic disk apparatus

A disk device comprising:

• a base having a disk and a head arranged therein, said base having a bottom surface and an outer peripheral wall, said outer peripheral wall having a first portion with an outer surface, and a second portion with a stepped outer surface, said stepped outer surface including a first surface and a second surface, with a step between said first and second surfaces, wherein said first surface is located near said bottom surface and outwardly projects from said first portion;
• a cover attached to the base to enclose the disk and the head within the base and the cover;
• said cover having a top cover portion having a top surface, a first flange portion extending from said top cover portion with a first height from said top surface, and a second flange portion extending from said top cover portion with a second height from said top surface that is less than said first height;
• and
• said first flange portion being fitted on said outer surface of said first portion of said outer peripheral wall of said base and extending generally flush with said bottom surface, said second flange portion being fitted on said second surface of said second portion.