公开(公告)号：DD139484A5

公开(公告)日：1980-01-02

申请号：DD20862578

申请日：1978-10-23

Applicant: IBM

Inventor： PORTER TOWNSEND H ,  SCHOPP ROBERT E

IPC: G11B5/82 ,  G11B3/58 ,  G11B17/03 ,  G11B23/00 ,  G11B23/033 ,  G11B23/04 ,  G11B25/04

Abstract: A thin flexible magnetic disk rotatably disposed in a cartridge of rigid material and protected thereby. The disk is loosely mounted on a driving hub assembly and has an arrow shaped center hole surrounding a central round hub portion of the hub assembly. A drive pin is carried by the hub assembly and extends loosely through a corresponding hole located in the disk and spaced from the center of the hub assembly and located on a radial line preferably of about 90 degrees with respect to a radial line passing through the apex of the straight hole edges forming the arrow so that the disk is automatically centered on the hub assembly due to any restraint on the disk during its rotation.

公开(公告)号：FR2408899A1

公开(公告)日：1979-06-08

申请号：FR7830409

申请日：1978-10-19

Applicant: IBM

Inventor： PORTER TOWNSEND H ,  SCHOPP ROBERT E

IPC: G05D3/12 ,  G11B5/596 ,  G11B21/10 ,  G11C11/02

Abstract: A magnetic disk provided with different digital bytes inside and outside of the center line of a magnetic track on the disk, and transducer and recording mechanism for detecting the passage of the digital bytes across the transducer and recording these bytes as the disk rotates so as to determine the distance the center of the transducer is spaced from the center line of the magnetic track. The recorded digital information is used for stepping a transducer stepping motor a distance corresponding to the stored digital information to move the transducer to have its center in correspondence with the center of the track. In one embodiment, the digital information is stored in a circular reference track adjacent the edge of the disk, and in another embodiment the digital information is stored in spiral tracks extending toward the center of the disk.