Resources Contact Us Home
Disk memory device

Image Number 2 for United States Patent #5111345.

A disk memory device is provided that will maximize the storage capacity of a memory disk while at the same time maximize the record and playback data rate. Two recording disks are mounted upon a common shaft that is rotated at a fixed speed. Each disk has a recording area including a surface upon which data can be recorded/read in the form of tracks arranged either in concentric tracks or in a spiral. The recording area surfaces are divided into multiple concentric track groups. Two read/write heads and two head positioning servos (including electronic controls) are mounted such that each disk recording surface can be read out or written by the read/write heads. Each track of the multiple track groups of the first disk are given designated numbers beginning with the outer track of the outermost or edge track group and continuing in higher consecutive numbers until the inner track of the innermost track group is designated. However, each track of the multiple track groups of the second disk are given designated numbers in the exact reverse order of the first disk, such that the combined length of a track from the first disk, when added to the length of the same numbered track of the second disk is a constant, generating a constant data rate for the disk memory device.

  Recently Added Patents
Electrical terminal
Method for manufacturing non-volatile memory device, non-volatile memory element, and non-volatile memory device
Electrode material and use thereof for production of electrochemical cells
Cellulose derivative and hydrogel thereof
Electronic device
Delivery of captions, content advisory and other data through digital interface
Multi-wired antenna for mobile apparatus
  Randomly Featured Patents
Vehicle humidity control apparatus for preventing fogging of windows
Data mining by retrieving causally-related documents not individually satisfying search criteria used
Reinforcing bar support for joining concrete structures
Apparatus and method for controlling a nuclear reactor
Method and apparatus for roughening a support for radiation-sensitive coatings
Rotary seal with pressurized air directed at fluid approaching the seal
Food product moulding process
Method and apparatus for dispensing material in a printer
Treatment of cardiac arrhythmias
Message alert system and method of providing message notification