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Rotational velocidensity affects all audio files encoded with lossy compression. These include mp3, aac, and ogg. The most notable effect of rotational velocidensity is the loss of bitrate in files. A lossy audio file will lose an average of 12kbps a year. But, this can vary greatly depending on the type of storage media used. Examples: SATA HDD: ~12kbps IDE HDD: ~15kbps SCSI HDD: ~7kbps DVD: ~16kbps CD-R/RW: >21kbps This can be overcome by compressing audio using lossless formats such as FLAC, APE, or TTA. These formats are designed to never lose quality over time, and will sound the same right now as they will in 10 years.
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