Advanced Technology Attachment: Béda antarrépisi

 

Ku ayana pangwanoh pasar kana [[Serial ATA]] taun 2003, ATA asli dingaranan '''Parallel ATA''' (PATA). Sajalan jeung ngaran aslina, artikel ieu ukur ngabahas ngeunaan Parallel ATA.

 

 

== Sajarah ==

Ngaran standar ieu aslina ''[[PC/AT]] Attachment'' alatan fitur utamana keur dihubungkeun langsung kana [[beus ISA]] 16-bit nu satuluyna katelah 'beus AT'; ngaran ieu dipondokkeun jadi "AT Attachment" keur nyegah kamungkinan isu merek dagang.

An early version of the specification, conceived by [[Western Digital]] in late [[1980s]], was commonly known '''Integrated Drive Electronics''' (IDE) due to the drive controller being contained on the drive itself as opposed to a separate controller connected to the motherboard, thus making the interface on the motherboard a ''host adapter'' — in contrast to popular belief, not an actual controller. '''Enhanced IDE''' (EIDE), an extension to original ATA standard again developed by Western Digital, allowed the support of drives having a storage capacity larger than 528 [[megabytes]] (504 [[mebibyte]]s), up to 8.4 [[gigabytes]]. Although these new names originated in branding convention and not as an official standard, the terms '''IDE''' and '''EIDE''' often appear as if interchangeable with '''ATA'''. This may be attributed to the two technologies being introduced with the same consumable devices, these "new" ATA hard drives. With the introduction of [[Serial ATA]] around 2003, conventional ATA was retroactively renamed to '''Parallel ATA''' ('''P-ATA'''), referring to the method in which data travels over wires in this [[Electrical connector|interface]].

 

 

The move from [[programmed input/output]] (PIO) to [[direct memory access]] (DMA) provided another important transition in the history of ATA. As every computer word must be read by the CPU individually, PIO tends to be slow and use a lot of CPU. This is especially a problem on faster CPUs where accessing an address outside of the cacheable main memory (whether in the [[Input/output|I/O]] map or the memory map) is a relatively expensive process. This meant that systems based around ATA devices generally performed disk-related activities much more slowly than computers using [[SCSI]] or other interfaces. However, DMA (and later '''Ultra DMA''', or UDMA) greatly reduced the amount of processing time the CPU had to use in order to read and write the disks. This is possible because DMA and UDMA allow the disk controller to write data to memory directly, thus bypassing the CPU.

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Congestion on the host bus to which the ATA adapter is attached may also limit the maximum burst transfer rate. For example, the maximum data transfer rate for conventional [[Peripheral Component Interconnect|PCI]] bus is 133 MB/s, and this is shared among all active devices on the bus.

 

 

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* [[Serial ATA]] (SATA)

 

 

* {{en}} [http://www.pcguide.com/ref/hdd/if/ide/over-c.html Sawangan jeung Sajarah IDE/ATA Interface]

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