I am playing from the actual disc when I have the problem, there are not any issues when playing from an mp3 previously ripped and imported to this hard drive.
My hard drive is a Seagate Barracuda ST31000524AS 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive.
I do not have any issues with playing a DVD such as Transformers.
What type of program are you playing them from?
Try playing the Trans-Siberian Orchestra CD through VLC player
and see if that helps.
I have been Win Media Player, and just tried VLC and have the same issue.