Bamboleo on 11 December 2009
I had same problem and days later I found out that my harddrive had some sort of "sleep mode".
When the consoles not accessing it, it just stops. When the console needs to access it the drive needs to "wake up" first and then read the content. That's why it caused some freezes.
And it was a western digital 500gb also dude... :\
Solution I found: Buy a different harddrive *sigh*
