Re: Ontrack Disk Manager

Re: Ontrack Disk Manager


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Posted by Henry on January 28, 2002 at 11:28:54:

In Reply to: Re: Ontrack Disk Manager posted by colin on January 27, 2002 at 20:45:45:

: Must be the mutual appreciation forum, who the hell would buy an ATA 66 add on card when nobody uses the standard. An ATA 100 card would be much more sensible and also backwards compatible with ATA 66 should you be unlucky enough to own one.
: Just passing on my experience and thoughts!


WHAT, PRECISELY is the advantage of ATA/100 over ATA/66?? WHY NOT recommend the ATA/133 card instead?? Apart from the approximately 2x cost multiplier for ATA/100 and 4x for ATA/133 and the fact that an ATA/100 card will empty a 2 MB HDD cache in about twenty (20) milliseconds (1/50 second) compared with about thirty-three (30) milliseconds (1/33 second) for the ATA/66 card and fifteen (15) milliseconds (1/66.6 second) for ATA/133. If you blink you miss it altogether. After the cache is empty you will be limited to the sustained data transfer of the drive which is well below 66 MB/sec. for every IDE HDD on the market. Higher card speed means that you empty the cache faster and get to the sustained data transfer rate that much sooner. Note that ATA/133 is twice as fast as ATA/66 for about fifteen (15) milliseconds - after that it depends on the drive, NOT the card.

One MIGHT measure performance differences between ATA/66, ATA/100 and ATA/133 cards and comparable HDDs using FAVORABLE benchmarks - but you WILL NOT percieve (that is, NOTICE) any differences among them because all of the cards are much faster than the drives (INCLUDING the latest ATA/133 drives). You are not likely to even measure a significant performance difference if you transfer files large enough to time with a stop watch.

I DO NOT recommend paying a premium for performance that can't be perceived.

Henry



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