Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Super-resolution optical recording medium on which information is recorded using train of prepits, optical recording medium reproduction device, and control method
Insertion tool for paddle-style electrode
Mobile communication terminal having a direct dial function using call history and method for performing the function
Compositions incorporating sesamin-class compounds and vitamin B1 class compounds
Method and apparatus of controlling uplink transmission power
Onions with high storage ability, high soluble solids content and/or low pungency
Blender container
  Randomly Featured Patents
Article comprising a broad band optical amplifier
Computer system integrating different data types into a single environment
Process for increasing and maintaining the filling power of tobacco
Peritoneal dialysis methods and apparatus
Magnetic recording medium
Inertial cycle exerciser
Versatile beach towel
Liquid crystal display and drive circuit thereof
Digitally controlled optical fiber delay line
Dosimetry coverall