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In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs. A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a constant linear velocity (CLV). If the disk is recorded at the same areal density throughout, then when read or written in CAV mode, the data rate is higher for the outer tracks than for the inner tracks, whereas in CLV mode, the data rate is the same everywhere.

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  • Constant angular velocity
  • CAV
  • 恒定角速度
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  • CAV(シーエーブイ)は、ディスクメディアの制御方式のひとつで、Constant Angular Velocity(=角速度一定)の頭文字を取ったもの。 ディスクの回転速度が常に一定であるため、内周部分に比べ外周部分の記録密度が低くなってくる。そのため、ディスク全体では線記録密度が一定であるCLVと比較すると容量が小さくなるというデメリットがあるが、ランダムアクセス性能やデータの読み書き速度では優れる傾向にある。 ディスクの回転速度を細かく制御する必要がないため、ディスクメディアの初期から使用されてきた。コンピュータ用の外部記憶装置など、高速なデータ読み書きが必要な用途に向いている。
  • 在光存储中,CAV(Constant angular velocity,中文解釋:恒定角速度、恒角速度、等角速度)是指光盘驱动器的额定转速限定符,并且还可以应用到等的写入速度。一在在CAV模式下運作的光盘驱动器或是磁碟機其转速為一定值,和CLV(等線速度)模式恰好相反。
  • In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs. A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a constant linear velocity (CLV). If the disk is recorded at the same areal density throughout, then when read or written in CAV mode, the data rate is higher for the outer tracks than for the inner tracks, whereas in CLV mode, the data rate is the same everywhere.
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  • In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs. A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a constant linear velocity (CLV). A typical CD-ROM drive operates in CLV mode, in contrast to a floppy or hard disk drive, or gramophone, which operates in CAV mode. In CAV mode, the spindle motor turns at a constant speed, which makes the medium pass by the read/write head faster when the head is positioned at the outside of the disk. In contrast, in CLV mode, the spindle motor speed varies so that the medium passes by the head at the same speed regardless of where on the disk the head is positioned. If the disk is recorded at the same areal density throughout, then when read or written in CAV mode, the data rate is higher for the outer tracks than for the inner tracks, whereas in CLV mode, the data rate is the same everywhere. An advantage of CAV mode over CLV is that the drive mechanism is easier to engineer (less expensive to build). Another advantage is that a device can switch from reading one part of a disk to reading another part more quickly, because in CLV mode, when the device moves the head in or out, it must change the speed of the disc.
  • CAV(シーエーブイ)は、ディスクメディアの制御方式のひとつで、Constant Angular Velocity(=角速度一定)の頭文字を取ったもの。 ディスクの回転速度が常に一定であるため、内周部分に比べ外周部分の記録密度が低くなってくる。そのため、ディスク全体では線記録密度が一定であるCLVと比較すると容量が小さくなるというデメリットがあるが、ランダムアクセス性能やデータの読み書き速度では優れる傾向にある。 ディスクの回転速度を細かく制御する必要がないため、ディスクメディアの初期から使用されてきた。コンピュータ用の外部記憶装置など、高速なデータ読み書きが必要な用途に向いている。
  • 在光存储中,CAV(Constant angular velocity,中文解釋:恒定角速度、恒角速度、等角速度)是指光盘驱动器的额定转速限定符,并且还可以应用到等的写入速度。一在在CAV模式下運作的光盘驱动器或是磁碟機其转速為一定值,和CLV(等線速度)模式恰好相反。
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