Method and apparatus for identifying disc type
AssigneeSamsung Electronics Co., Ltd.
InventorsSang-whook Kim, Young-woo Lee
Life of this patent
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Abstract
A method and apparatus identifying a type of a recordable disc using the reflectivity and RPM (Rotation Per Minute) of the disc. The method includes the operations of detecting an RPM (Rotation Per Minute) of the disc, identifying a first disc type by comparing the RPM with a first reference value, measuring the reflectivity of the disc, and identifying a second disc type between a one-time recordable disc type and a re-recordable disc type by comparing the reflectivity of the disc with a second reference value. Accordingly, the lead-in time of the disc can be reduced.
Claims8
A method of identifying a type of a disc, comprising:
- detecting an RPM (Rotation Per Minute) of the disc;
- and
- identifying a first disc type of comparing the RPM with a first reference value,
- wherein the first reference value is in a form of RPM,
- wherein the identifying of the first disc type includes determining that the disc is a DVD(−) type if the RPM is lower than the first reference value and that the disc is a DVD(+) type if the RPM is not lower than the first reference value.
An apparatus identifying a type of disc, comprising:
- a motor rotating the disc;
- and
- a system controller identifying the type of the disc by comparing an RPM of the disc detected using a frequency signal generated at the motor with a first reference value,
- wherein the first reference value is in a form of RPM,
- wherein the system controller determines that the disc is a DVD(−) type if the RPM is lower than the first reference value and that the is disc is a DVD(+) type if the RPM is not lower than the first reference value.
A method of identifying a disc type, comprising:
- comparing a reflectivity of light from a disc to a reflective reference value;
- identifying the disc type as a one-time re-recordable type if the reflectivity is higher than the reflectivity reference value and as a re-recordable type if the reflectivity is less than the reflectivity reference value;
- comparing an RPM of the disc to a speed reference value;
- identifying the disc format as a DVD(−) type disc if the RPM is lower than the speed reference value or as a DVD(+) type if the RPM is higher than the speed reference value;
- and
- setting the speed reference value to identify the disc as a DVD(−) type if the disc rotates at 2600 RPM in a stabilized wobble CLV 1X mode and as a DVD(−) type if the disc rotates at a velocity exceeding 2600 RPM.
A method of identifying a disc type, comprising:
- comparing a reflectivity of light from a disc to a reflectivity reference value;
- identifying the disc type as a one-time re-recordable type if the reflectivity is higher than the reflectivity reference value and as a re-recordable type if the reflectivity is less than the reflectivity reference value;
- comparing an RPM of the disc to a speed reference value;
- identifying the disc format as a DVD(−) type disc if the RPM is lower than the speed reference value or as a DVD(+) type if the RPM is higher than the speed reference value;
- setting a control mode of a spindle motor to a stable wobble CLV servo mode if the disc is identified as a DVD(−) type to control the RPM of the disc;
- and
- returning a spindle motor to a control mode using FG signals before reaching a maximum RPM of the disc drive in order to protect performance of the spindle motor if the disc is identified as a DVD(+) type.
A method of identifying a type of a disc, comprising:
- comparing a disc reflectivity with a first reference value;
- identifying the disc as a DVD(R) type if the reflectivity is higher than the first reference value and as a DVD(RW) if the reflectivity is lower than the first reference value:
- generating FG signals from a spindle motor;
- and
- measuring an RPM of the disc using the FG(Frequency Generation) signals;
- comparing a measured RPM with a second reference value;
- and
- identifying the disc as a DVD(−) type if the RPM is lower than the second reference value and as a DVD(+) type if the RPM is higher than the second reference value.
Dependencies are inferred from the claim text.