Overview of SATA
- SATA (Serial AT Attachment) is the standard interface for
connecting hard drives inside desktop computers.
- It provides a one-to-one connection between the drive and the motherboard, with
separate cables for power and data.
- SATA does not support daisy-chaining or multiple drives on a single cable.
SATA Versions and Speeds
- SATA Revision 1.0: 1.5 gigabits per second (Gbps).
- SATA Revision 2.0: 3 Gbps (doubled from 1.0).
- SATA Revision 3.0: 6 Gbps (doubled from 2.0).
- SATA Revision 3.2: 16 Gbps.
SATA Connectors
- Power Connector: 15-pin (longer connector).
- Data Connector: 7-pin (smaller connector).
- Some drives also support the older Molex power connector as an alternative.
- Motherboards typically have multiple SATA ports, often labeled by version (e.g.,
SATA 2 or SATA 3).
Connecting SATA Drives
- Each SATA drive requires two connections: one for power and one for data.
- The data cable connects the drive to the motherboard.
- The power cable connects the drive to the power supply.
- Example: A motherboard with eight SATA ports can support eight
drives.
Identifying SATA Ports on a Motherboard
- SATA ports are usually located near the bottom of the motherboard.
- They may be color-coded (e.g., blue, orange, black) to indicate different versions or channels.
- Example configurations:
- A motherboard with six SATA ports (supporting SATA 2 and SATA 3).
- A motherboard with four SATA ports in a different alignment.
eSATA (External SATA)
- eSATA is the external version of SATA, designed for connecting external drives.
- Functionality is similar to internal SATA, but the connector is different.
- Supports cable lengths of approximately two meters.
- Key differences:
- eSATA connectors are not compatible with internal SATA connectors.
- eSATA cables have a distinct shape and cannot be plugged into SATA ports (and vice versa).
- eSATA ports are typically found on the back of a computer.