Record medium reproducing device

U.S. Patent Number: 5392413

Abstract: In a CD-ROM disk reproducing device, for a data read instruction which specifies an address issued frequently from a host computer, irrespective of whether the device has a Lock Cache function, the time required from receipt of a data read instruction up to the actual data transfer is reduced. The data read instruction which specifies an address issued frequently from the host computer is discriminated by a microcomputer constituting a control section in the device and the read data from the address is locked in a storage section (buffer RAM) so as not to be erased. When a data read instruction specifying the same address is received afterward, data is read out directly from the storage section and transferred to the host computer.

Inventors: Nomura; Naomi (Chigasaki, JP), Tanase; Tadashi (Chigasaki, JP), Takeshita; Shigehiko (Chigasaki, JP), Hayashi; Hiroyuki (Yokohama, JP), Ono; Kazuhiko (Chigasaki, JP)

Assignee: Hitachi, Ltd. (Tokyo, JP)

Application Number: 07/897,021

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 711/113

Field of search: 364/2MSFile,9MSFile 395/400,425

Click the image above to view patent images at uspto.gov within a frame.

Click here for the fulltext page on uspto.gov within a frame.