Frank: Hot damn, the H140s couldn't make it past 3.0!!!
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.
SATA HDD: ~12kbps
IDE HDD: ~15kbps
SCSI HDD: ~7kbps
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.