Method for coordinating the writing and reading speeds of a CD-R/W drive
View Patent ↗A method used in a CD-R/W drive for coordinating the writing and reading speeds of a CD-R/W drive is disclosed. With the aid of the method, the writing speed of the CD-R/W drive is able to be adjusted, and thus a more stable writing operation is obtained. In the method, if the time(s) that the buffer has been cleaned up is/are not larger than the predetermined value, the CD-R/W drive will write data to the CD-ROM at its highest speed. On the contrary, if the time(s) that the buffer has been cleaned up is/are larger than the predetermined value, the CD-R/W drive will slow down stepwise from the current speed to a lower speed. To accomplish the invention, the CD-R/W drive is either controlled by computer programs or by a programmably pre-written control chip that is installed in a control circuit inside the CD-R/W drive itself.
1. A method for coordinating the writing and reading speeds of a CD-R/W drive having a buffer, said method comprising the steps of:
1) starting a writing process;
2) loading said writing process, and then actuating a writing operation;
3) detecting if the buffer is empty or not? if “true”, calculating the time(s) that the buffer has been cleaned up;
4) determining the time(s) that the buffer has been cleaned up has/have reached to a predetermined value or not;
5) if “false”, performing said writing process;
6) if “true”, performing a slowing-down process, and then performing said writing process;
7) detecting if the buffer is empty or not? if “false”, detecting if said writing process ends or not; and
8) if the result being “true”, terminating said writing process; if “false”, performing said writing process.
2. The method for coordinating the writing and reading speeds of a CD-R/W drive as claimed in claim 1 , wherein said slowing-down process includes the steps of:
1) starting a slowing-down operation;
2) determining if a driving speed is larger than 20× or not? if “true”, performing writing operation at 20× speed; if “false”, detecting if the driving speed is larger than 16× speed or not;
3) determining if the driving speed is larger than 16× or not? if “true”, performing writing operation at 16× speed; if “false”, detecting if the driving speed is larger than 12× speed or not;
4) determining if driving speed is larger than 12× or not? if “true”, performing writing operation at 12× speed; if “false”, writing at the lowest speed;
5) confirming the writing speed; and
6) terminating said slowing-down process, and performing said writing process.
3. The method for coordinating the writing and reading speeds of a CD-R/W drive as claimed in claim 1 , wherein said time(s) that the buffer has been cleaned up is/are controlled by software.
4. The method for coordinating the writing and reading speeds of a CD-R/W drive as claimed in claim 1 , wherein said times that the buffer has been cleaned up are 5.