USB 2.0 drive slow

Ultimate Windows 7 ultimate 32-bit
April 20, 2011 at 01:06:54
Specs: Windows 7, E8400, 4GB
I've just bought an external hard drive the other day, Hitachi X500 USB2.0 HDD.
the thing doesn't come with any power adapter, and use a y split USB cable to plug into 2 USB ports to get enough juice I think.

at first I plugged it onto the front of my PC (those plugs all connects to the same plug on the mobo), the HDD starts but write rate is abysmal (11GB takes 3 hours, that's like 1MB per second, hardly, I can torrent faster than that!), sometimes the drive would even fail to start up.

then I plugged the thing into 2 different USB ports that are completely separated(as in, both plugs to a different plug on the mobo), and gotten an improvement on speed, but not much. it started the transfer at 16MB/s, but quickly dropped to 8MB/s

I know USB 2.0 is rated at 480 Mbit/s [60 MB/s], but real life performance is closer to half of that.
but 8MB/s is like, 1/8th of the theoretical speed, less than half of the normal performance you'd expect?

my question is, is it possible that slow speed is due to not enough juice? (i've checked, the drive is indeed connected through 2.0. device manage says it's hooked up to Enhanced host controller)
or, if there's any other factor that's affecting this?


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April 20, 2011 at 03:55:43
take it back and swap it for another model with its own power supply cable, if it needs so much power from usb, its not really practical. and you should be getting better read write than that, 25MB is normal for me and thats not great..

i hate computers!
but cant help myself....

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