Quote: "Because the additional time spent to accurately measuring it could just be spent doing the operation in the first place"
Not really. Most of the bottleneck is not in the CPU but in the drives themselves and the interfaces (USB) nowadays.
Quote: "I tell you this though: Never buy packard bell. My CD drive just blew up, literally. I put a CD in, there was a massive BANG and suddenly, pieces of PC coming out of the drive."
That's the cases, they're not well designed and cause microfractures in the inner ring which spread due to centrifugal force stretching the disc.