Overview
This lecture covers the SATA (Serial ATA) interface standard used for connecting storage devices in computers, including speed revisions, connectors, and the difference between internal SATA and external eSATA.
SATA Interface and Versions
- SATA stands for Serial ATA (Advanced Technology Attachment).
- SATA Revision 1.0 transfers data at 1.5 Gbps over a 1-meter cable.
- SATA Revision 2.0 increases speed to 3 Gbps.
- SATA Revision 3.0 further increases speed to 6 Gbps.
- SATA Revision 3.2 enables speeds up to 16 Gbps over the same cable length.
SATA and eSATA Connections
- SATA is used internally within computers for connecting storage devices.
- eSATA (External SATA) allows external device connection, matching internal SATA speeds with a max cable length of 2 meters.
- SATA hard drives have a 7-pin data connector and a 15-pin power connector.
- Some drives support older 4-pin Molex power connectors for compatibility with older power supplies.
Motherboard and Drive Connectivity
- SATA connections are one-to-one, with one power and one data connector per device.
- Each data connector on the motherboard links to one storage drive using a dedicated cable.
- SATA ports may be color-coded by revision/version, but colors differ by motherboard manufacturer.
- For multiple drives, each must have its own power and data connection.
eSATA Connectors and Usage
- eSATA ports are physically different from internal SATA connectors and require eSATA-specific cables.
- eSATA adapter cards can add external SATA connections to a computer.
- Some external drives offer multiple connection types, including FireWire, USB2, and eSATA.
Key Terms & Definitions
- SATA (Serial ATA) — Standard interface for connecting internal storage devices in computers.
- eSATA (External SATA) — Interface for connecting external storage devices, similar in speed to internal SATA.
- Molex Connector — Older 4-pin power connector compatible with some SATA drives for legacy support.
- One-to-One Connection — Each SATA data or power connector supports only one device.
Action Items / Next Steps
- Identify and label SATA ports and connectors in your computer.
- Practice connecting both SATA and eSATA devices, ensuring correct cable type is used.
- Review the speed differences between SATA revisions for exam preparation.