System for data communication between disk adapter and disk cartridge drive where adapter controller sending busy signal to disk cartridge drive if adapter controller is unavailable

An adaptor shaped to be inserted into a slot of a disk cartridge drive that is designed to receive a disk cartridge containing a disk, for transferring data between the adapter and the disk cartridge drive, comprising:

• a first communication interface between the adapter and the disk cartridge drive;
• a controller for controlling the first communication interface;
• a data transfer unit provided for the first communication interface, for transferring preset data to the disk cartridge drive when the controller is unavailable to control the first communication interface, when the data transfer unit has:
• a counter for counting index pulses generated at internals of the duration of the specific track;
• a data pattern unit for storing data patterns and corresponding counts to be counted by the counter;
• and
• data selector for selecting one of the output of the controller and the output of the data pattern unit according to the status of the controller.

An adaptor shaped to be inserted into a slot of a disk cartridge drive that is designed to receive a disk cartridge containing a disk, for transferring data between the adapter and the disk cartridge drive, comprising:

• a first communication interface between the adapter and the disk cartridge drive;
• a controller for controlling the first communication interface;
• a data transfer unit provided for the first communication interface, for transferring preset data to the disk cartridge drive when the controller is unavailable to control the first communication interface, wherein:
• the controller assigns a specific sector to data to be transferred from the adapter to the disk cartridge drive;
• and
• the data transfer unit transfers the preset data with the specific sensor.