Wed Oct 26 17:05:26 CST 2022
This article will help you Understand this external storage interface based on SATA standards.
USB and FireWire have been a huge boon to external storage. Still, the performance of these storage devices compared to desktop drives has always lagged. With the development of Serial ATA (SATA) standards, a new external storage format, external Serial ATA, has entered the marketplace.
External SATA is an industry standard for controlling the various hardware used to connect external storage devices. It competes with some Firewire and USB standards to provide faster data transfer speeds between hardware devices.
Both USB and FireWire interfaces are high-speed serial interfaces between a computer system and external peripherals. USB is more general and used for a wider range of peripherals such as keyboards, mice, scanners, and printers. FireWire is almost exclusively used as an external storage interface.
Even though these interfaces are used for external storage, the drives used in these devices use the SATA interface. The external enclosure that houses the hard drive or optical drive uses a bridge that converts signals from the USB or FireWire interface into the SATA interface required by the drive. This translation leads to some degradation in the overall performance of the drive.
One advantage that both of these interfaces implemented was the hot-swappable ability. Previous generations of storage interfaces typically did not support the ability to have drives dynamically added or removed from a system. This feature is what made the external storage market explode.
External Serial ATA is a subset of the additional specifications for the Serial ATA interface standard. It is not a required function, but an extension that can be added to both controller and devices. For eSATA to function properly, both connected devices must support the necessary SATA features. Many early generation SATA controllers and drives do not support the Hot Plug capability that is critical for the function of the external interface.
Even though eSATA is part of the SATA interface specifications, it uses a different physical connector from the internal SATA connectors to better shield the high-speed serial lines transferring the signals against EMI interference. It also provides a 2-meter overall cable length compared to the 1 meter for internal cables. As a result, the two cables aren't interchangeable.
One of the key advantages that eSATA offers over USB and FireWire is speed. While the other two incur overhead from converting the signal between the external interface and the internal based drives, SATA does not have this problem. Because SATA is the standard interface used on many new hard drives, a simple converter between the internal and external connectors is required in the housing. Thus, the external device should run at the same speed as an internal SATA drive.
The various interfaces each have a theoretical maximum transfer speed:
USB 1.1: 15 Mbps
FireWire (1394a): 400 Mbps
USB 2.0: 480 Mbps
FireWire 800 (1394b): 800 Mbps
SATA 1.5: 1.5 Gbps
SATA 3.0: 3.0 Gbps
USB 3.0: 4.8 Gbps
USB 3.1: 10 Gbps
The newer USB standards are faster in theory than the SATA interface that the drives in the external enclosures use. Because of the overhead of converting the signals, the newer USB still proves slightly slower. However, for most consumers, there is almost no difference. Accordingly, eSATA connectors are less common now, given that USB-based enclosures are more convenient.
What is an eSATA port used for?
An eSATA port connects to external drives like hard disk drives (HDDs) or optical drives with an eSATA cable. If your computer lacks an eSATA port, you can purchase an adapter bracket.
What is an eSATA/USB combo port?
This type of port is a hybrid between eSATA and USB, which means it can house both USB devices and eSATA drives and connectors.
Refer to Lifewire-Mark Kyrnin
By HornmicLink_Henry @221026 17:18