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iMac 3TB HDD is slower than 1TB

barefeats

barefeats

macrumors 65816
Original poster
Jul 6, 2000
1,058
19
Just tested both with QuickBench 4.04.

Large 1TB Sequential Custom Test (average of 5 iterations):
1TB = 208MB/s READ, 207MB/s WRITE
3TB = 174MB/s READ, 173MB/s WRITE

Also faster on small random writes:
1TB = 57MB/s
3TB = 38MB/s

Tested two 3TB in case it was a dud. No dud. Just slower.

Not a huge deal but just thought you would like to know.

P.S. Those are not Fusion Drives -- just the regular HDDs.
 
Last edited:
M

MeFromHere

macrumors 6502
Oct 11, 2012
468
16
What drive models?

There have been indications that Apple is using more than one disk vendor in each system type. Can you post the model numbers of the particular drives you tested?

Thanks.
 
barefeats

barefeats

macrumors 65816
Original poster
Jul 6, 2000
1,058
19
X

XionCore

macrumors member
Nov 27, 2012
32
0
3 TB drives are slower by design due to the more dense-packed platters (single disks inside the HDD)
 
Metal Dice

Metal Dice

macrumors regular
Jun 3, 2009
233
0
Denmark
I would really like for us to be able to conclude on this. Is there anybody that could confirm the results of barefeats.
 
Metal Dice

Metal Dice

macrumors regular
Jun 3, 2009
233
0
Denmark
Is there anybody else that could contribute with benchmark results or something. It find this HDD speed difference very important, but it seems as if I'm alone.
 
dukee101

dukee101

macrumors 6502
Jan 17, 2009
293
147
Puevlo said:
No. As the data is smaller the reader has to squint harder to read it.
Click to expand...

No, that's simply untrue.

Higher areal densities mean there's more data crammed into the same amount of space, which means that once the read-write head scans any given block, it will read/write more in a given moment than if the density were lower.

Increased areal density therefore leads to increased speeds. The more gigabytes you can pack onto a platter, the faster your hard disk drive should become.
 
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