Memory connectors:
The term refers to an interface used for connecting memory devices, which could be classified based on its individual uses, as was shown below.
(1) SATA: The abbreviation of Serial ATA (Advanced Technology Attachment, another name of the first-generation IDE), a hard disk interface that replaces PATA, which is divided into 2 parts: signal (7 wires) and power supply (15 wires).
(2) SAS: The abbreviation of Serial Attached SCSI, compatible with SATA.
(3) SCSI: Small Computer System Interface, which has developed to the sixth generation, with 25 pins, 50 pins, 68 pins, or 80 pins, arranged in 2 rows or 3 rows, and there are many interface forms.
(4) E-SATA: External SATA, which is an extended specification of SATA, used for connecting external devices, with 7 wires, and it is fool-proof via thickness and groove.
(5) NGFF: Next Generation Form Factor, which has two kinds of interface, M-key, i.e., the former name of M.2 interface (PCI-E 4x channel) and B-key (SATA or PCI-E 2x channel).
(6) VHDCI: Very High Density Connector Interface, which is a kind of SCSI connector.
(7) IEEE-1394: Also known as firewire, with a serial interface, and 6 pins or 4 pins.
(8) M.2: i.e. NGFF, an interface customized for ultrabooks, which replaces mSATA, and is compatible with many protocols, such as SATA