SATA consists of an 8 mm wide wafer connector on each end and the cable has a 7-pin connector, 3 grounds and 4 active data lines in two pairs. Each cable has two or three connectors, one connector is attached to the interface that connects to the computer system (mother board) and the others are connected to the drives. The connectors are black in a 40-pin connector while in an 80-pin connector, they come in 3 colors: blue - controller, gray - slave drive, and black - master drive. 80-pin connectors were also introduced later. IDE consists of a 40-pin connector attached to a ribbon cable. Parallel ATA only allows data cable lengths up to 18 in (457 mm) while SATA allows cable lengths up to 1 m (3.28 ft). Hard drives need a cable/connection for data and one for power. The IDE data cable is ribbon-like (on the left) The SATA hard drive has the data cable on the right and power cable on the left. To set the primary drive, you can access the settings from the computers BIOS (special software that runs when you start the computer). Each drive connects directly to the motherboard. The computer system has no idea which is the main drive, from which to load the OS. To connect multiple IDE drives, you need to chain the ribbon cables from one to the next. In a computer system, it's possible to have more than one harddrive. Power and data split into two connections. Narrow, can be up to a meter (roughly 3ft) long. Ribbon-like, wide, can be up to 18 inches long IDE interface does not support hot pluggingĭata transfers at the rate of up to 133MB/sĭata transfers at the rate of up to 6 Gb/s Hot plugging (add/remove component while the computer is running) Lower MTBF than SAS (700,000 hours to 1.2 million hours of use at 25 ☌), less suited for servers. Lacks support for new technology such as native command queuing and hot-plugging hard drives Comparison chart IDE versus SATA comparison chart
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