Re: Can I create a successive file

Bo Yang <struggleyb@xxxxxxxxx> writes:
On 12=D4=C210=C8=D5, =CF=C2=CE=E75=CA=B154=B7=D6, David Schwartz <dav...@we=
bmaster.com> wrote:
On Dec 9, 6:24 pm, Bo Yang <struggl...@xxxxxxxxx> wrote:

I am sorry, but I don't understand this. Why not the OS send some
commands like read 1k sectors from 'some starting sector'? Why the OS
take care of each sector?

That would be less flexible for no benefit. The drive already knows
how to do read ahead and there is no need for one command to cover so
much data. The drive already has a large enough buffer to hold the
last of one full rotation of the disk while it starts reading the next
one, and that's all that's needed to "cover the gap".

In any event, consecutive sectors for large files are ludicrously
overrated. You're not going to get predictable latency from a hard
drive under realistic conditions anyway.

Really? But the guys from Google said, they use consecutive blocks for
fast disk reading!


Google does a lot of custom stuff, including their own hardware
and filesystems.

scott
.

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