2 pogona na enem IDE kanalu

Kupujem novejšo matično ploščo in ker ima večina novejših plošč le en IDE kanal, jaz pa disk in DVD snemalnik na tem vodilu, me zanima, kako se v praksi obnašata kot master in slave na enem kanalu.

Na Wikipediji sem našel tole:

"One operation at a time"
This is a much more important effect. It is caused by the omission of both overlapped and queued feature sets from most parallel ATA products. This means that only one device on a cable can perform a read or write operation at one time. Therefore, a fast device on the same cable as a slow device under heavy use will find that nearly every time it is asked to perform a transfer, it has to wait for the slow device to finish its own ponderous transfer.

For example, consider an optical device such as a DVD-ROM, and a hard drive on the same parallel ATA cable. With average seek and rotation speeds for such devices, a read operation to the DVD-ROM will take an average of around 100 milliseconds, while a typical fast parallel ATA hard drive can complete a read or write in less than 10 milliseconds. This means that the hard drive, if unencumbered, could perform more than 100 operations per second (and far more than that if only short head movements are involved). But since the devices are on the same cable, once a "read" command is given to the DVD-ROM, the hard drive will be inaccessible (and idle) for as long as it takes the DVD-ROM to complete its read—seek time included. Frequent accesses to the DVD-ROM will therefore vastly reduce the maximum throughput available from the hard drive. If the DVD-ROM is kept busy with average-duration requests, and if the host operating system driver sends commands to the two drives in a strict "round robin" fashion, then the hard drive will be limited to about 10 operations per second while the DVD-ROM is in use, even though the burst data transfers to and from the hard drive still happen at the hard drive's usual speed.

The impact of this on a system's performance depends on the application. For example, when copying data from an optical drive to a hard drive (such as during software installation), this effect probably doesn't matter: Such jobs are necessarily limited by the speed of the optical drive no matter where it is. But if the hard drive in question is also expected to provide good throughput for other tasks at the same time, it probably should not be on the same cable as the optical drive.

Remember that this effect occurs only if the slow drive is actually being accessed. The mere presence of an idle drive will not affect the performance of the other device on the cable (for a modern host adapter which supports independent timing).


Če sem pravilno razumel, nastanejo problemi šele takrat, ko obe napravi na istem kanalu bereta (pišeta),
če pa ena bere, druga pa piše, pa ni problemov. Je tako? Torej, rad bi se le prepričal, da bo zapisovanje DVD snemalnika teklo pri polni hitrosti, medtem ko bo podatke dobival od diska z istega IDE kanala. In v obratni smeri.

Prosim za čimprejšnjo pomoč, najraje v obliki vaših izkušenj s takšno postavitvijo.
Najlepša hvala!

bo delovalo brez problema. Načeloma tudi ni nič narobe, če obe napravi pišeta. Nero te bo mogoče pred zapisovanjem opozoril, da imaš dve napravi na istem IDE kanalu, vendar pa bo kljub temu zapisal CD/DVD brez napak oz. prekinitev.