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
Acoustical receiver and pen transcription system adapted for rejecting virtual pen images
Gravimetric dispensing system
Method and apparatus for efficiently routing packets across disparate networks
Electrical power connector system including power rail
Solid state imaging device
Case assembly and method for covering and protecting a portable device
Mounting method and device for tire pressure monitoring sensor
  Randomly Featured Patents
Travel limit stop device for a motor-reducing unit intended in particular for a window wiper
Word transformation apparatus for digital information processing
Barcode optical character recognition
Cooled optical window for semiconductor wafer heating
Apparatus for flame-perforating films and methods of flame-perforating films
Color image forming apparatus having an adjustor which corrects the position of a latent image according to registration marks
Technique for growth of thin film lithium niobate by liquid phase epitaxy
Apparatus for radially securing a cartridge inserted by a breechblock into the weapon barrel of a firing weapon
Storage device for personal dental hygiene and oral care products
Bird toys