Magnetic disk memory comprising a membrane spring-braced bearing of a disk pack which is rotatably mounted at both ends

A magnetic disk memory comprising:

• a housing comprising a one-piece support shell including first and second parallel spaced apart walls;
• a disk pack including a spindle perpendicular to said walls and having first and second ends, first and second ball bearings each including an inner ring fixedly mounted on a respective spindle end and an outer ring, first and second bearing bushings respectively mounted on said outer rings, said first bearing bushing connected to said first wall, a hollow hub about and connected to said spindle for mutual rotation therewith, said hub comprising a hollow tube and a web in said tube secured to said spindle, a drive motor in said hollow tube including a stator connected to said first bearing bushing and a rotor fixed to the inner surface of said hollow tube, and at least one magnetic disk carried on the exterior of said hub;
• and
• pre-stressing means connecting said second bearing bushing to said second wall and effective to draw said bearing bushings in opposite directions towards the respective shell walls and suppress axial play of said bearings.