> So the Hitachi ones are lighter than the WD ones and behave like mobile > hdds in that respect. Yes, these Hitachi is lighter and more sensitive to vibrations - even hanging on wires is sufficient for twice perfomance drop - the whole vibro silence is requred for it to reach the max speed. I think this is mostly the hardware design flaw of this particular model - will return all of them. > "The same HDD with another SATA controller (checked with Asus M2NPV and > M5A78 m/b) shows normal write (150Mb/s-300Mb/s) perfomance." > > Does that mean that the Hitachi hdd which was performing badly in the > Tyan board, didn't receive vibrations when connected to the Asus mobo > simply because the Asus mobo is in a different chassis which absorbs > vibrations somehow? Yes, as the Asus mobo as the "working good" S8005GM2NR one has the different chassis that has very small vibration, so for tests I did not put the HDD inside - it was simply laying on chassis surface - this is why connecting the same HDD shows the normal perfomance. > All I'm saying is, if you switch mobos and use the same chassis which > generates vibrations, you should be seeing the same performance drop > with the Asus board and this way confirm your findings. Sure. I've made the simple test - took out the HDD from the vibrating case - run dd and see the 100Mb/s perfomance. Next simply puted the HDD on the vibrating 1U case surface and run the dd test again - the perfomance immediatly dropped to 20Mb/s. This is constantly reproducable ;) These HDD is unusable where the fans exists - seems like everywhere ;) -- Rus -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
