ATA (44) internal pinoutThis connector is mostly used for 2.5 IDE HDD of notebooks and so on. See ATA pinout for pins 1-40.
ATA (50) internal pinoutThis 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 pinoutATA=AT bus Attachment. Used at the PC, Apple Macintosh and some other computers
ESDI pinoutESDI=Enhanced Small Device Interface. Developed by Maxtor in the early 1980´s as an upgrade and improvement to the ST506 design.
IDE Internal (old) pinoutIDE=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 pinoutSCSI 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
ST506/412 pinoutDeveloped 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.
Apple PowerBook ATA pinoutUsed 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.