Hard disk or can be called a hard drive, fixed disk, HDD, or enough hard disk only, is the medium used to store files and data in computer systems. Hard disk consists of three main parts, namely magnetic discs, mechanical parts, and head to read data. The disk used to store data, while on duty mechanical parts rotate the disc.
Kind of hard disk space varies, depending on the categories used. For example, based on the type of interface, the rate of data transfer speeds and data storage capacity.
Types of interfaces found on various hard disk, which is ATA (IDE, EIDE), Serial ATA (SATA), SCSI (Small Computer System Interface), SAS, IEEE 1394, USB, and Fibre Channel. Type of interface determines the level of data rate or speed of data transfer. For example, a SCSI hard disk transfer speed ± 5 MHz, that is able to enter into a data transfer up to 5 Mb per second.
Among the many types of interfaces, only three types of hard disks are often used, ie IDE, SATA, and SCSI. SCSI hard disks are usually used in servers, workstations, and Apple Macintosh computers starting in the mid 1990s until now. While hard disks are widely used in personal computers (PCs) is a type of SATA.
ATA
AT Attachment (ATA) interface standard for connecting storage devices like hard disks, CD-ROM drive, or DVD-ROM drive on your computer.
ATA stands for Advanced Technology Attachment. ATA Standard is managed by a committee named X3/INCITS T13. ATA also has several other names, such as IDE and ATAPI. Since the introduction of the latest version of the ATA called Serial ATA, ATA version was later renamed Parallel ATA (PATA) to distinguish the new version of Serial ATA.
Parallel ATA only allows a maximum cable length is only 18 inches (46 cm), although there are many products available on the market that has a length of up to 36 inches (91 cm). Because of the short distance, PATA is only suitable for use in the computer. PATA is very inexpensive and commonly found in computers.
This default name is the first PC / AT Attachment. Its main feature is that it can accommodate a direct connection to the ISA BUS 16-bit so called AT bus. This name was later shortened to AT Attachment to resolve copyright issues.
SATA
SATA is the development of the ATA. SATA is defined as a technology designed to replace the ATA in total. Of serial ATA adapter can accommodate data transfers at speeds higher than the simple ATA.
The first-generation SATA interface known as SATA/150 or often referred to as SATA 1. 1 communicate with the speed of SATA 1.5 GB / s. Uncoded his transfer speed is 1.2 GB / s. SATA/150 have almost the same speed PATA/133, but the latest version of the SATA has many advantages (such as native command queuing) which causes it to have more speed and ability to perform work in multitask environments.
In the early period of SATA/150, adapters and drive makers use a bridge chip to convert an existing design with PATA interface. Bridge device has a SATA connector and has some power connector. Gradually, the bridge to accommodate the native SATA products. SATA is the current speed of 3GB / s and now experts are designing technology for SATA 6Gb / s.
Some features of SATA are:
* SATA uses four signal line which allows the cable is more compact and inexpensive compared to PATA.
* SATA accommodate new features such as hot-swapping and native command queuing.
* Drive SATA controller can be plugged into Serial Attached SCSI (SAS) so that it can communicate with the same physical cable as native SAS disks, but SAS disks can not be plugged into the SATA controller.
Power cable and SATA cable has changed significantly compared to Parallel ATA cables. SATA data cable using seven conductors in which four of whom are active for the data line. Therefore, the shape is smaller, easier to use the SATA cable in the room that is narrower and more efficient for cooling.
SCSI
SCSI (Small Computer System Interface), pronounced "skasi" is a standard created for the purposes of data transfer between computers and other peripherals. SCSI standards define commands, protocols, and electrical and optical interfaces required. SCSI offers data transfer speeds are highest among other standards.
Use the most numerous in the SCSI hard disks and tape drives. However, SCSI is also included with scanners, printers, and optical devices (DVD, CD, and others). Standard SCSI devices are classed as standard SCSI-independent so that theoretically could be applied in all types of hardware.
Based on the rate of rotation speed, type of IDE hard disk has a rotation speed of 5400 rpm and 7200 rpm. While the SCSI hard disk capable of rotating between 10,000 sd 12 000 rpm.
The level of your hard disk rotation speed is measured in units of RPM (rotation per minute / revolutions per minute). The faster the spin the hard disk, then the amount of data that can be read by the head more and more. And vice versa.
Some brands of hard disk is used, among others, Western Digital (WDC), Quantum, Seagate, Maxtor, Samsung, IBM, Toshiba, and Hitachi.
Kind of hard disk space varies, depending on the categories used. For example, based on the type of interface, the rate of data transfer speeds and data storage capacity.
Types of interfaces found on various hard disk, which is ATA (IDE, EIDE), Serial ATA (SATA), SCSI (Small Computer System Interface), SAS, IEEE 1394, USB, and Fibre Channel. Type of interface determines the level of data rate or speed of data transfer. For example, a SCSI hard disk transfer speed ± 5 MHz, that is able to enter into a data transfer up to 5 Mb per second.
Among the many types of interfaces, only three types of hard disks are often used, ie IDE, SATA, and SCSI. SCSI hard disks are usually used in servers, workstations, and Apple Macintosh computers starting in the mid 1990s until now. While hard disks are widely used in personal computers (PCs) is a type of SATA.
ATA
AT Attachment (ATA) interface standard for connecting storage devices like hard disks, CD-ROM drive, or DVD-ROM drive on your computer.
ATA stands for Advanced Technology Attachment. ATA Standard is managed by a committee named X3/INCITS T13. ATA also has several other names, such as IDE and ATAPI. Since the introduction of the latest version of the ATA called Serial ATA, ATA version was later renamed Parallel ATA (PATA) to distinguish the new version of Serial ATA.
Parallel ATA only allows a maximum cable length is only 18 inches (46 cm), although there are many products available on the market that has a length of up to 36 inches (91 cm). Because of the short distance, PATA is only suitable for use in the computer. PATA is very inexpensive and commonly found in computers.
This default name is the first PC / AT Attachment. Its main feature is that it can accommodate a direct connection to the ISA BUS 16-bit so called AT bus. This name was later shortened to AT Attachment to resolve copyright issues.
SATA
SATA is the development of the ATA. SATA is defined as a technology designed to replace the ATA in total. Of serial ATA adapter can accommodate data transfers at speeds higher than the simple ATA.
The first-generation SATA interface known as SATA/150 or often referred to as SATA 1. 1 communicate with the speed of SATA 1.5 GB / s. Uncoded his transfer speed is 1.2 GB / s. SATA/150 have almost the same speed PATA/133, but the latest version of the SATA has many advantages (such as native command queuing) which causes it to have more speed and ability to perform work in multitask environments.
In the early period of SATA/150, adapters and drive makers use a bridge chip to convert an existing design with PATA interface. Bridge device has a SATA connector and has some power connector. Gradually, the bridge to accommodate the native SATA products. SATA is the current speed of 3GB / s and now experts are designing technology for SATA 6Gb / s.
Some features of SATA are:
* SATA uses four signal line which allows the cable is more compact and inexpensive compared to PATA.
* SATA accommodate new features such as hot-swapping and native command queuing.
* Drive SATA controller can be plugged into Serial Attached SCSI (SAS) so that it can communicate with the same physical cable as native SAS disks, but SAS disks can not be plugged into the SATA controller.
Power cable and SATA cable has changed significantly compared to Parallel ATA cables. SATA data cable using seven conductors in which four of whom are active for the data line. Therefore, the shape is smaller, easier to use the SATA cable in the room that is narrower and more efficient for cooling.
SCSI
SCSI (Small Computer System Interface), pronounced "skasi" is a standard created for the purposes of data transfer between computers and other peripherals. SCSI standards define commands, protocols, and electrical and optical interfaces required. SCSI offers data transfer speeds are highest among other standards.
Use the most numerous in the SCSI hard disks and tape drives. However, SCSI is also included with scanners, printers, and optical devices (DVD, CD, and others). Standard SCSI devices are classed as standard SCSI-independent so that theoretically could be applied in all types of hardware.
Based on the rate of rotation speed, type of IDE hard disk has a rotation speed of 5400 rpm and 7200 rpm. While the SCSI hard disk capable of rotating between 10,000 sd 12 000 rpm.
The level of your hard disk rotation speed is measured in units of RPM (rotation per minute / revolutions per minute). The faster the spin the hard disk, then the amount of data that can be read by the head more and more. And vice versa.
Some brands of hard disk is used, among others, Western Digital (WDC), Quantum, Seagate, Maxtor, Samsung, IBM, Toshiba, and Hitachi.
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