[ddots-l] I/O buffer size and latency

my sonar6 producer installation on an ADK laptop is set to a I/O buffer size of 128(advanced page of audio options). The sonar default is (according to the help files) 64.
I'm using the internal system drive for audio data(7200 rpm drive). I'm wondering what the best setting for the I/O buffer size would be to maximize latency and minimize dropouts. How does this variable affect disk throughput, and with this kind of system drive, what might be a better setting than 128KB?
Currently, I can record at 24 bits with minimally perceptable latency with input echo on. Naturally, I'm trying for zero latency while recording audio, but I start getting dropouts when I start cutting the latency slider any further than 50% for the Edirol FA66(ASIO). Wouldn't recording at 16 bits improve latency(50%less data throughput involved with 16bits from 24bits).
I like the headroom and quality that comes from 24bits, but I want that zero latency for obvious reasons. That's why I'm considering changing the disk I/O buffer size--it seems to be the only variable left that might improve performance. 
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