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System for simulating access times of a CD ROM on a hard disk by slowing the operation of the hard disk

  • US 5,121,492 A
  • Filed: 03/02/1987
  • Issued: 06/09/1992
  • Est. Priority Date: 03/02/1987
  • Status: Expired due to Fees
First Claim
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1. A method for simulating predetermined transfer operations of blocks of data in a target data storage unit having a first data access time and being intended for use with a host computer, wherein the simulation occurs on a separate storage memory having a second data access time which is faster than said first data access time, and during simulation all of the blocks of the data are contained in the separate storage memory to which a simulation computer has direct high speed access, the simulation not requiring the blocks of data to be pre-fixed on the media target data storage unit, the method comprising the steps of:

  • a. determining, for a transfer operation by which data is transferred from the target data storage unit to a host computer, the units of time required for such transfer in accordance with said first data access time of the target data storage unit,b. fixing the time of direct access by the simulation computer to the data stored in the separate storage memory to correspond to the duration of the calculated performance time by adjusting the effective rate at which data is transferred from the separate storage memory to the simulation computer to correspond to the time required by the determining step,c. retrieving the data from the separate storage memory based upon said second data access time and transferring the retrieved data to said simulation computer in accordance with the fixed time of direct access, andd. providing the results of the direct access to the user.

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