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Hello, i would like to know What is Esata and what the basic difference between esata and sata disk ? actually i wanted to purchased a new harddisk and a portable disk and was being told that new esata is also what would you like to take your suggestion before going to purchase. thanks for your suggestion .
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e-SATA (external SATA) is an adaptation of the SATA protocol connecting external devices. Its main features are:
- Voltage greater than the emission standard SATA (500-600 mV instead of 400-600 mV);
- Voltage receiving less than the standard SATA (240-600 mV instead of 325-600 mV);
- Identical protocol in order to use the same equipment;
- Maximum cable length of 2 m.
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eSATA means eSATA External Serial Advanced Technology Attachment. It is used for SATA technologies. In fact, SATA is considered the next generation bus interfaces for internal hard drives. This technology has been proven to be simpler than its predecessors. It can provide a greater rate of transfer through the structural design standard.
Unlike the parallel cables are much broader and shorter, the cables used in SATA technology is a bit narrow and can only reach about 3 feet. As a product of SATA, eSATA extends the possibilities of technology transfer of data to support external storage devices.
The main advantage of using eSATA is that it is capable of transfer speeds of approximately three times faster than FireWire 400 and USB 2.0. Unlike USB and FireWire, eSATA does not reflect the data as it is copied or moved from the interface to the computer, or vice versa. This allows the computer to save the CPU resources, while allowing the user to enjoy high speed data transfer. In addition, eSATA, also has a hot-swappable feature that speeds up the process of making storage devices from one place to another.
To use the eSATA external disk storage, you must ensure that your computer has an eSATA connector. If not, you can install a bus pass. This is to provide your PC with an eSATA interface. On the other hand, if you have a laptop, you can use Peripheral Component Interconnect (PCI) card. After that, you must connect the external drive's eSATA power connector to a power source. Thus, you can proceed to copy files from your computer to the external drive
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The external SATA port located near other ports I / O on the back of the card allows the connection and configuration of hot plug devices Easily save your pictures, videos and other multimedia content on personal external devices. eSATA port is there behind my system basically, it was for external sata hard drive
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this standard defines the use of Serial ATA interface externally. Indeed, until now there are many solutions using SATA externally, but they are based on the SATA as defined for internal use.
Internally, the Serial ATA is designed for cables with a maximum length of 1 meter, with a signal from 400 to 600 mV in emission and a receiver (side drive) that can decode a signal ranging from 325 to 600 mV, because losses in the cabling and connections.
With eSATA, one passes to cables of 2 meters, but as the sign is to be 500-600 mV in transmission and the decoder must be able to work on a voltage of 240 to 600 mV. In addition, the connectors are modified to better prevent accidental disconnection.
Ultimately the benefits of SATA for connecting storage devices are three-fold compared to the FireWire or USB 2. First point, the SATA is natively managed by hard drives, it is no longer necessary to have an additional chip is responsible for translating the signals. Then, as the USB 2.0 Serial ATA is handled natively by the chipset, which is not really the case of FireWire, which requires an additional chip on the motherboard or an additional card if this is not the case .
Last point, the flows are much more important since in practice, the USB 2 to about 35 Mb / s to 40 Mb / s for FireWire 400 and 90 MB / s for FireWire 800. With Serial ATA 1.5 Gbps and 3.0 Gbps, it is very close to theoretical maximums, which are respectively 150 and 300 Mb / s. Of course we need to do have hard drives that follow, or at least a RAID 0 of 2 discs in the first case, a RAID 0 of 4 drives in the second case, the fastest disks reaching 60 to 70 MB / s at the beginning of the runway.
When showing the IDF, has used two Seagate eSATA 160 GB disks 7200 rpm in RAID 0 connected to an eSATA PCI card Netceler RAID, and made a backup 5 times faster than USB 2.0.
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Initially SATA was designed as an internal or inside-the-box interface technology, bringing improved performance and new features to internal PC or consumer storage. Creative designers quickly realized the innovative interface could reliably be expanded outside the PC, bringing the same performance and features to external storage needs instead of relying on USB or 1394 interfaces.Called external SATA or eSATA, customers can now utilize shielded cable lengths up to 2 meters outside the PC to take advantage of the benefits the SATA interface brings to storage. SATA is now out of the box as an external standard, with specifically defined cables, connectors, and signal requirements released as new standards in mid-2004. eSATA provides more performance than existing solutions and is hot pluggable.
Why to use eSATA?
- Extra shielding layer to reduce EMI
- Recessed connector to prevent ESD
- Fully support hot-plug. (Motherboard or controller also have to support)
- Provides easy way to replace, upgrade or expand storage without downtown
- Native SATA interface at 3Gbs transfer rates also supports Native Command Queuing (NCQ) to get the most performance from PC technology
- Up to 6 times faster than USB2.0 & IEEE1394
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