OK I've moved this to the Windows forum. This is really a hardware question and we have no hardware forum so if you actually use Linux then I guess that forum would be more appropriate for it.
Anyway asking "Could any one please explain the difference between PCI and SATA ?" is a bit like asking "What's the difference between a pencil and an apple?" There is no basis for comparison they are completely different things.
PCI is a bus that is used to connect peripheral hardware, modems, I/O cards, very low end graphics cards to the processor in a PC. It replaced the existing (E)ISA bus and has fairly recently been replaced by the PCI Express bus.
SATA or Serial ATA is a bus used to connect a hard disk drive to the hard disk controller. It is a serial version of and replacement for ATA, now often refered to as PATA or Parallel ATA.
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