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Friday, November 13, 2015

SATA review

Many people often hear the hard disk type SATA or PATA/ATA. What is the difference from the actual SATA and PATA technology?
Before we understand first the notion of PATA and SATA, both of which are based on of the ATA (Advanced Technology Attachment), a standard used to connect hard disk, CD-ROM, DVD-ROM drive on the computer.
PATA used to mention largely parallel ATA and SATA for Serial ATA:

PATA (Largely Parallel ATA)
PATA harddrive initially called ATA or IDE, but after the advent of SATA added landing strips in front of words to tell the difference between PATA and SATA technology. The Largely because their installation done in ATA largely parallel with other device/IDEA.
PATA doesn't have Hot Swappable capabilities, data cable needed reach 40 cable that makes it judged impractical, as well as having a maximum interface cable length 18 inches (46 cm), but many of the products also are available on the market that have a length of up to 36 inches (91 cm).

This limitation makes the PATA interface are just as internal storage. This Interface also experienced slow growth starting in 1994. UDMA 6 (133) or Ultra DMA 133 is a breakthrough last issued in 2005 and from that point arguably PATA hard drive development stops.

SATA (Serial ATA)
SATA is PATA development team, first released in 2002. SATA is defined as technology that is designed to replace the ATA in total. Where a device is mounted on a single SATA ports, so that the installation cable neater and less than PATA cables.
Use of NCQ (Native Command Queuing) used in SCSI hard drive, as a result of mechanical performance is also more efficient and keep the old hard drive into an older (durable) and access data much faster than PATA. SATA uses encoding 8/10 bytes, with the level of efficiency at 80%.

With NCQ SATA technology, it is possible to interface external (eSATA) and hot plug without leaving the facility to make a hard disk as a removable storage.

Some SATA features are:
  • SATA uses a line 4 which allows the cable signal is more concise and inexpensive compared to PATA.
  • SATA to accommodate new features such as hot-swapping and native command queuing.
  • The SATA drives can be plugged into the controller Serial-Attached SCSI (SAS) so that it can communicate with the same physical cable as native SAS disks, SAS disks, however, could not be plugged into SATA controllers.
SCSI (Small Computer System Interface)
SCSI is widely used for the connection in the Server and are also widely used by the Apple device. SCSI has a wide variety of versions i.e. SCSI, Ultra-2 SCSI and Ultra-3 SCSI.

SCSI-1 has two kinds of speed that works in asynchronous, i.e. 3.5 MB/sec or 5 MB/sec. Cable length reaches six meters.

In 1989 a SCSI version 2 was launched, in this version there are two variants i.e. Fast SCSI has a speed of 10MBps and Wide SCSI has a speed of 8 MBps.

Then the presence of SCSI version 3 has two variants, namely Ultra SCSI and Ultra Wide SCSI.

And in 1997 launched Ultra-2 SCSI and has 2 variants, i.e. SCSI Ultra2 speeds of 40MBps and has Wide Ultra2 SCSI has a speed of 80Mbps. both use cable reached 12 meters. Then on Ultra-3 SCSI version has speed 160Mbps.

Hard disk SCSI is used more for servers or systems which require very fast hard disk, e.g. for the purposes of multimedia. Because the price is expensive enough, then this interface is rarely used for personal purposes.

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