Hmmm, it could be normal. When a CD gets read, it asks for an IRQ, but specifically, DMA will want direct memory access (that's what DMA stands for) and it will use the CPU to accomplish all this. Furthermore, the TOC (table of contents) from the DVD has to be read and built in the explorer screen. If your CPU is too low, it can stutter. But those DVD's have lots of space on them, so it takes a while before everything is loaded. Maybe an SATA DVD drive could solve this, since the transmission speed for reading and writing will be higher with these. Nothing else you can really do about this, except for disabling some startup services or programs which also read that same DVD and load it's content into their program. MS Office had such an application, and when indexing on files in the explorer is enabled, it gets loaded into that as well. The purpose of the latter is to make searches go lots faster, since the TOC and all available files in already scanned and present in a list. The DVD or any other media doesn't have to be started again.
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