Hard drives connectors pinouts listing

• ATA (44) internal This connector is mostly used for 2.5 IDE HDD of notebooks and so on. See ATA pinout for pins 1-40.
• ATA (50) internal This connector is mostly used for 2.5 IDE HDD of laptops and some other device. Equal to ATA (44) connector, except 50 pin connector used.
• ATA / IDE interface ATA=AT bus Attachment. Used at the PC, Apple Macintosh and some other computers ????
• ESDI ESDI=Enhanced Small Device Interface. Developed by Maxtor in the early 1980´s as an upgrade and improvement to the ST506 design.
• IDE Internal (old) IDE=Integrated Drive Electronics.Developed by Compaq and Western Digital. Newer version of IDE goes under the name ATA=AT bus Attachment.
• SCSI All pinouts and some information SCSI stands for Small Computer Systems Interface. It´s a standard for connecting peripherals to your computer via a standard hardware interface, which uses standard SCSI commands
• SCSI Centronics 50 pin (Differential) use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.
• SCSI Centronics 50 pin (Single-ended) use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.
• SCSI External D-Sub (Future Domain) Seems to be available on some Future Domain SCSI-controllers only.
• SCSI External D-Sub (PC/Amiga/Apple Macintosh) 
• SCSI External IBM Burndy Special invention by IBM for use on IBM RS/6000 and IBM PS/2
• SCSI Internal (2.5 inch) 
• SCSI Internal (Differential) 
• SCSI Internal (Single-ended) SCSI=Small Computer System Interface. Based on an original design by Shugart Associates. SCSI was ratified in 1986.
• SCSI-2 External Hi D-Sub (Differential) 
• SCSI-3 External Hi D-Sub (Differential) 
• SCSI-3 External Hi D-Sub (Differential) SCA=Single connector Attachment
• SCSI-3 External Hi D-Sub (Single-ended) SCA=Single connector Attachment
• SCSI-3 Low Voltage Differential/Single Ended (LVD/SE) external connector 
• SCSI-II external, Ultra SCSI (Single-ended) 
• Serial ATA (SATA) The Serial ATA [SATA] bus is the serial version of the IDE [ATA] spec. Primarily used for hard disk connections.
• ST506/412 Developed by Seagate. Also known as MFM or RLL since these are the encoding methods used to store data. Seagate originally developed it to support their ST506 (5 MB) and ST412 (10 MB) drives.

• Adaptec RAIDport 

• Apple PowerBook ATA Used on PowerBooks for the 2.5" drives. The internal hard disk has a 48-pin connector that carries both the ATA signals and the power for the drive.
• Apple PowerBook SCSI these connectors are found on the SCSI Disk adapter cable

• Novell and Procomp External SCSI This interface is nowadays considered obsolete.
• Paravision SX-1 External IDE Paravision was formerly Microbotics.