The front panel header is where the connectors of hard disk drive activity lights, case speaker, reset button, power on/off button, computer power on light, and key lock, are connected to make them function smoothly.
Integrated Drive Electronics (IDE)
It's commonly known as IBM Disc Electronics, ATA or Parallel ATA (PATA)
34-pin cable used for floppy drives & 40-pin cable for hard drives and optical drives
Transfer speeds max out at 133 MB/s
Length can up to 18 inches(1.5 feet)
Serial Advanced Technology Attachment (SATA)
Transfer speeds max out at 187.5 MB/s to 1,969 MB/s