The Ultra DMA (Ultra Direct Memory Access, UDMA) modes are the fastest methods used to transfer data through the ATA

hard disk A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating hard disk drive platter, pla ...

interface Interface or interfacing may refer to: Academic journals * ''Interface'' (journal), by the Electrochemical Society * '' Interface, Journal of Applied Linguistics'', now merged with ''ITL International Journal of Applied Linguistics'' * '' Inter ...

, usually between a computer and an ATA device. UDMA succeeded

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Multiword DMA The Word DMA (WDMA) interface is a method for transferring data between a computer (through an Advanced Technology Attachment (ATA) controller) and an ATA device; it was the fastest method until Ultra Direct Memory Access (UDMA) was implemented. ...

as the interface of choice between ATA devices and the computer. There are eight different UDMA modes, ranging from 0 to 6 for ATA (0 to 7 for

CompactFlash CompactFlash (CF) is a flash memory mass storage device used mainly in portable electronic devices. The format was specified and the devices were first manufactured by SanDisk in 1994. CompactFlash became one of the most successful of the e ...

), each with its own timing. Modes faster than UDMA mode 2 require an 80-conductor cable to reduce data

settling time In control theory the settling time of a dynamical system such as an amplifier or other output device is the time elapsed from the application of an ideal instantaneous step input to the time at which the amplifier output has entered and remained ...

s, lower impedance and reduce

crosstalk In electronics, crosstalk (XT) is a phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel. Crosstalk is usually caused by undesired capacitive, ...

. {, class="wikitable" style="text-align:center" , + Transfer modes ! Mode , , Number , , Also called , , Maximum transfer
rate (MB/s) , , Minimum
cycle time , , Defining
standard , - , rowspan=8 , Ultra DMA , 0 , , , , 16.7, , 120 ns , ,

ATA-4 Parallel ATA (PATA), originally , also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers. It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD o ...

, - , 1 , , , , 25.0, , 80 ns , , ATA-4 , - , 2 , , Ultra ATA/33, , 33.3, , 60 ns , , ATA-4 , - , 380-conductor cable required , , , , 44.4, , 45 ns , ,

ATA-5 Parallel ATA (PATA), originally , also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers. It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD o ...

, - , 4 , , Ultra ATA/66, , 66.7, , 30 ns , , ATA-5 , - , 5 , , Ultra ATA/100, , 100, , 20 ns , ,

ATA-6 Parallel ATA (PATA), originally , also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers. It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD o ...

, - , 6 , , Ultra ATA/133, , 133, , 15 ns , ,

ATA-7 Parallel ATA (PATA), originally , also known as Integrated Drive Electronics (IDE), is a standardization, standard Interface_(computing), interface designed for IBM PC-compatible computers. It was first developed by Western Digital and Compaq in ...

, - , 7 , , , , 167 , , 12 ns , ,

6.0CompactFlash 6.0 Introduction
{{Webarchive, url=https://web.archive.org/web/20101121233926/http://compactflash.org/2010/cf-6-0-introduces-industry-leading-performance-and-feature-enhancements/ , date=2010-11-21

References

AT Attachment

See also

References