Tom's Hardware > Forum > Storage > Hard Disks > SATA transfer rates... etc.

SATA transfer rates... etc.

Forum Storage : Hard Disks - SATA transfer rates... etc.

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syrist   10-30-2007 at 05:45:31 PM

I'm using HD Tune to benchmark some SATA II drives running on a Sata 1.5 Gb/s connection and then on a Sata 3.0 Gb/s connection (AHCI mode). HD Tune reported that the transfer rates were idential but yet I would've expected the Sata 3.0 Gb/s connection to be much faster.

It may sound silly but I expected it to be double in such a way that a large file would copy from one Sata II drive to another Sata II drive in half the amount of time.

The burst rate was 30% higher on the Sata 3.0 Gb/s connection but what good would that do if the internal transfer rates of the hard drives are a fraction of the speeds of the connecting controller?

-Pete

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4745454b   10-30-2007 at 06:18:14 PM
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Because you are being limited by the slow mechanical harddrive. Heres something you might not like to hear. Look at the graphs in HD tune. Are they (the lines) even above the ATA100/133 specs? (meaning can you transfer more then 100MBs? A single harddrive can't even go above the old IDE specs speed, they certainly can't go above SATA speeds.

 

The thing I've been telling people is you can't increase the bus speed and expect faster devices. This is true for the FSB, PCI/PCIe, SATA, USB, Hyper transport, etc. If the SATA bus is a four lane highway with a speed limit of 70MPH, and your harddrive is one of those electric plug in cars that has a top speed of 30MPH, doubling the bandwidth, or in this case the speed limit, to 140MPH won't let you go any faster. The device you are using is still mechanically limited to 30MPH.


Message edited by 4745454b on 10-30-2007 at 06:18:41 PM
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syrist   10-31-2007 at 06:20:39 PM
- 0 +

Man, I can't wait until high capacity solid state hard drives take over.

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