Data storage library magnetic disk retain and exchange system

A method of operating a disk media retain and exchange system for a read-write device, the method comprising:

• installing a disk media assembly, comprising a disk medium and a ferromagnetic material coupled with a center-hole of the disk medium, onto a spindle motor assembly, comprising a spindle motor including a flange configured to support a disk medium and a permanent magnet retainer coupled with the spindle motor, by:
• applying current in a first direction to a first electromagnet of a disk exchange tool holding the disk media assembly to rotate the spindle motor assembly to magnetically align the ferromagnetic material of the disk media assembly with the permanent magnet retainer of the spindle motor assembly;
• removing the current to the first electromagnet of the disk exchange tool to enable a first major flux path between the permanent magnet retainer of the spindle motor assembly and the ferromagnetic material of the disk media assembly, thereby retaining the disk media assembly on the spindle motor assembly via an attractive magnetic force corresponding to the first major flux path;
• and
• removing the disk exchange tool from proximity with the spindle motor assembly and disk media assembly.

A disk media system comprising:

• a spindle motor assembly comprising:
• a spindle motor including a flange configured to support a disk medium, and
• a permanent magnet retainer coupled with the spindle motor;
• a disk media assembly comprising:
• a disk medium, and
• a ferromagnetic material coupled with a center-hole of the disk medium;
• means for magnetically aligning the ferromagnetic material of the disk media assembly with the permanent magnet retainer of the spindle motor assembly;
• means for sensing that the magnetically aligning is complete;
• and
• means for enabling a first major flux path between the permanent magnet retainer of the spindle motor assembly and the ferromagnetic material of the disk media assembly such that the disk media assembly is magnetically retained onto the spindle motor assembly via an attractive magnetic force corresponding to the first major flux path.