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bought a WD Black 1TB

QueBert

QueBert

Lifer
I have a question, I made 2 partitions on it, and when I copy from partition to partition it's as slow, or slower than my external USB drive. I get about 18mb/s. When I copy to my other HD it's 45mb/s or so. Is this amount of slow down normal for copying from and to the same HD? Also any reason why it would benchmark faster 3 times in a row in UDMA5 mode over SATA-II, I know the drive can't take advantage of SATA-II speed, but I don't see why on the UDMA5 one I get 10-15mb/s better read speeds and 15mb/s higher burst on Hd Tech.
 
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I bought one of these too, except I've got an RMA number for mine, since the BIOS on my Asus M2N32-Deluxe wouldn't detect the drive.

Why can't the drive take advantage of SATA-II speed?
 
the current SATA drives can't even take full advantage of the original SATA's speed. I didn't expect the SATA-II port to be faster but slower is really odd to me.
 
Something is severely wrong there. Depending on a few things, that drive should be pushing 75-95 megs/second transfer. Might be a bad drive, or might be something in the bios. Is the Sata set to AHCI/RAID? Some Sata controllers are terrible unless running in AHCI, and still some others suck period (this is the case on my GA790X-UD4P's secondary Sata raid controller).

That's a kickass drive when running correctly.
 
Read write speeds are going to be faster drive to drive no matter what you do. When you copy to one partition from another, your drive is doing twice the work.
 
I don't know the exact numbers, but it's normal for a disk-to-same-disk copy to be slower than copying to a different disk. The heads can only be one place at a time, so while they are reading the original file, they can't be writing the new file at a different location. Offhand, I'd expect such transfers to be half the speed of a disk-to-different-disk copy.
 
Arkaign said:
Something is severely wrong there. Depending on a few things, that drive should be pushing 75-95 megs/second transfer. Might be a bad drive, or might be something in the bios. Is the Sata set to AHCI/RAID? Some Sata controllers are terrible unless running in AHCI, and still some others suck period (this is the case on my GA790X-UD4P's secondary Sata raid controller).

That's a kickass drive when running correctly.
Click to expand...

it's not going to get 75-95 partition to partition, the 2nd drive it's coping too is older and slower, so I think that's limiting the transfer speed. HD Tech is showing the average read speed as about 80, which is pretty good. I thought doing partition to partition would only about half the speed since it's doing twice the work, but I guess it takes an ever bigger hit. I'll look into the AHCI thing, I dunno what the BIOS is set for. I did update my p35's chipset drivers since I've installed the drive.
 
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