Patent ID: 6317281
Filing Date: 2001-11-13
Classification: G11B

Abstract:
A disk storage device for recording and reproducing data to and from a storage medium according to a command given by a higher rank device, comprising:data transfer control means for transferring data from said higher rank device to said storage medium and transferring data from said storage medium to said higher rank device;identification means having identification information present in the disk storage device for determining whether data is permitted or inhibited to write into a predetermined recording area of said storage medium;data transfer command means responsive to a data write command together with data write inhibition from the higher rank device for transferring data from the higher rank device to the storage medium, the data being recorded on the storage medium, and identification information indicating the data write inhibition being set in a separate memory in the disk storage device from the storage medium for data management;wherein said data transfer command means includes a microprocessor in the disk storage device, said microprocessor collates a state of said data write command with said identification information possessed by the predetermined sector of said storage medium, and when at least one of said data write command and said identification information indicates data write inhibition and a data write operation is requested by the higher rank device, said microprocessor informs said higher rank device of a write inhibition error;a state display means including a counter connected to said microprocessor, said microprocessor collates whether the predetermined sector of said storage medium indicated by said data write command is already set in said data write inhibition, and when at least one of said data write command and said identification information indicates data write inhibition, said counter on the disk storage device displays a data write inhibition error of said predetermined sector in response to an order given by said microprocessor; andwherein when a data write command comes together with a data write inhibition from the higher rank device, the predetermined sector of the storage medium is decided whether or not the sector is permitted to write data by said identification means, the data is written into the predetermined sector when the predetermined sector is a data write permission, and the predetermined sector is set to a data write inhibition.