1. Power pins on mainboard
Power pins are responsible for providing voltage to the mainboard. There are many types of power pins: main power pins, CPU power pins, and fan power pins.
2. Storage device power pins on mainboard
There are many standards for connecting storage devices:
- FDD (Floppy Disk Drive)
- IDE (Integrated Drive Electronics)
- SATA (Serial Advanced Technology Attachment)
- SCSI (Small Computer System Interface)
FDD is a 35-pin floppy drive connector standard, rarely used now.
IDE is connector standard for ATA storage devices. Connectors on an IDE cable have 40 pins.
SATA is also a storage device connector standard, but has a higher data transfer rate than IDE.
SATA has data transfer rates of 150MB/s (SATA 1.0), 300MB/s (SATA 2.0) and 600MB/s (SATA 3.0).
SCSI is a high-end standard for servers, with 50 or 68 pins. It has high data transfer rate about 320MB/s, 640MB/s.