摘要:
An optical disk of recording type on which data is recordable is provided which includes a data recording and reproducing area for recording data therein and reproducing data therefrom, and a read-only disk identification information area for recording disk identification information for identifying the optical disk therein. In the optical disk, the disk identification information is formed by removing a reflection film formed on the optical disk in a strip shape. The disk identification information includes an inherent disk identifier for each optical disk, and the data recording and reproducing area includes an area for recording therein encrypted data, which is encrypted using information including the disk identification information for identifying the optical disk as a key.
摘要:
Address groups are composed of two of address blocks 16 , 17 , 18 , and 19 , where the address blocks 16 , 17 , 18 , and 19 are disposed in a sector address region 5 and include identifiable information of address numbers 13 and overlapping sequential numbers 14 . The address groups are disposed so that each group is alternately shifted from a track center 2 toward the inner periphery side or the outer periphery side, by a width substantially equal to half the track pitch, along the radius direction.
摘要:
An optical disk has a rewritable first recording area (5) and a read-only (2,3) second recording area. The first recording area (5) includes first tracks composed of groove tracks and land tracks formed on an optical disk substrate alternately in a spiral or concentric shape. Each of the first tracks is divided into a plurality of first sectors, and each of the first sectors includes a first header region having identification data (11a,11b) for identifying the first sector and a first data region (17) for recording user data by forming recording marks by changing optical characteristics of a recording surface. The second data recording area includes second tracks formed with physical concave and convex shaped pit rows arranged on the optical disk substrate in a spiral or concentric shape. Each of the second tracks is divided into a plurality of second sectors, and each of the second sectors includes a second header region having identification data (31) for identifying the second sector and a second data region having read-only data recorded as the pit rows. The first header region includes a physical concave and convex shaped first pit row. Each pit of the first pit row (21a,21b) has a width in a radial direction of the optical disk substantially equal to a width of the groove track and is wobbled outward or inward from a center line of the groove track by about a quarter of a pitch of the groove track. The second header region includes a physical concave and convex shaped second pit row (29). Each pit of the second pit row has a width in the radial direction of the optical disk smaller than the width of the groove track and is formed substantially along the center line of the second track.
摘要:
In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1/2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.
摘要:
In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1/2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.
a history determination step for determining whether or not a medium being cased and capable of being used for information recording and reproducing ,has previously been taken out from the case by using an identification section having historical information as to whether the medium has previously been taken out from the case or not ;and when a result of the determination shows that the medium has previously been taken out from the case ,
for verifying correctness of information after recorded or recording after verification of correctness of information always or on condition that a predetermined condition is satisfied ,or inhibiting the recording , if the medium is a first recording/reproducing information medium that is required to use a case at recording ,and for recording normally if the medium is a second recording/reproducing information medium that is not required to use a case at recording.