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To: Bob Jagow who wrote (4396)	6/14/1998 5:07:00 PM
From: ftth	Read Replies (3) of 11149

Bob, ATA (whether Ultra-DMA or not) is a single-threaded I/O interface, and can only execute 1 request at a time. It also doesn't support command queuing or overlapped seeks. If the data is interleaved, not sure how the heads could be in place. In any event, there is still rotational latency. I just don't buy it that separate IDE drives give any improvement. re:<< Not sure what single processor has to do with it.>> A single processor can't execute threads in parallel. It relies strictly on the thread scheduler to execute them in (multiplexed) series, which has higher overhead than linear execution on a single processor. Concurrent execution is the only reason to have a multiprocessor system. dh dh

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