Almost all connectors are designed as such. PATA and SATA cables are usually keyed so that they can only be connected in one direction. SCSI connectors are shaped in a way that makes it impossible to establish a complete connection in the wrong direction.
a sata power connector is normally used for powering sata dvd drives as well as sata hard drives and ssd drives
A parallel ATA connector can use one data cable for two drives.
molex for IDE devices and sata power connector for SATA devices
A Molex Connector connects to optical drives and hard drives.
A Berg connector is used for providing power to floppy drives and sometimes other peripherals.
This is commonly referred to as a "Berg connector", after it's original manufacturer, the Berg Electronics Corporation.
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A Molex power connector is a 4-pin power connector found in most computer power supplies. It is used to provide power to large internal drives like hard drives and CD/DVD drives. They are slowly being replaced by SATA power connectors, which are easier to install can cannot be inserted incorrectly. They should not be confused with a Berg connector which is much smaller and is used to power floppy drives. The molex connector is used for IDE drives
No, most new hard drives use Serial ATA or SATA connectors.
under the dash, behind the fuse box on the drives side. you'll need to remove the connector that is attached to it first. It's under the hood on the drives side and has a bolt in the center that holds the connector to the EEC. The EEC then slides out from under the dash on the drives side, behind the fuse box.
The most important reason the PATA connector is present is the PATA connector can be used for EIDE drives such as a CD or DVD drive.
S.M.A.R.T. was introduced in ATA-3. along with 44 pin connector for 2.5" drives.