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Posted by Quaoar on April 2, 2005, 10:44 am
Please log in for more thread options J. Clarke wrote:
> Dorothy Bradbury wrote:
>
>> The benefit of SATA 2.5" disks is mainly in 2 areas:
>> o New laptop SATA chipsets might offer RAID for them
>
> IDE chipsets offer RAID and there are in fact laptops that have RAID
> onboard now. So SATA gains you nothing there.
>
>> o SATA 2.5" HD may support NCQ/TCQ - which re-orders (slow) seeking
>
> I have yet to see NCQ/TCQ demonstrate any real-world benefits on
> single user machines.
>
>> The migration is eventually to twin 1.8" SATA drives for laptops,
>
> No, the migration is, perhaps eventually to single 1.8" drives in
> laptops allowing for smaller, lighter machines. If there was any
> demand for RAID on laptops then the ones that have it would be more
> popular.
>
>> allowing users to run them in RAID-1 (good) or RAID-0 (adventure).
>>
>> NCQ/TCQ offers a 10-15% benefit in re-ordering seeks - but requires
>> support in the HD + Chipset + OperatingSystem. It's what SCSI does.
>> Electromechanical seeking is a major bottleneck in terms of speed.
>
> So please provide a reference to tests that show that there is any
> difference in function that is perceptible to the user when NCQ is
> enabled on a single-user machine with a single drive. Not benchmarks
> that show that in some arcane ubernerdly sense there is a
> "performance improvement" but something that the guy sitting at the
> machine running code other than benchmarks actually sees.
>
> This is an example of nerds seeking nerdware for nerdly reasons.
A 10K rpm IDE drive would be a good choice. If there were any. SATA
looks like a solution to cabling in smaller cases, maybe. Sort of like
PCI-Express: new tek looking for a driving force.
Q
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