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Old Feb 9, 2013, 10:56 AM   #1
loicg
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Join Date: Jan 2013
New iMac 27" and USB3: Something must be wrong here (speed)

Hi folks,

I'm using for a couple of weeks the new imac 27 (basic one), and I bought an ICY BOX IB-120CL-U3 and 2 WD green caviar 3To for backup purposes.

I use superduper software to start the first backup copy. I am very surprise to see these figures below: effective speed below 15MB and "max speed" according to system report being 12MB... Any idea? That's annoying as I was seeking for this USB3 speed.

Here the speed in superduper, from the imac drive to the backup drive:


Here the system report:




(The ICY BOX is meant to be UBS3 compatible and I used the blue cable that was in the package.)

Thanks for your help!
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Old Feb 10, 2013, 08:23 AM   #2
loicg
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After a second try, the max speed I got was much better, nearly 60 MB/sec, not more but looks fine to me.
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Old Feb 10, 2013, 09:05 AM   #3
seanm9
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the WD greens, if i remember correctly are for low power usage and not speed... but glad you worked it out...
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Old Feb 10, 2013, 09:11 AM   #4
loicg
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True, 5400rpm, their purpose is more for backup uses, but I expected something better than USB 1.1
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Old Feb 10, 2013, 09:14 AM   #5
old-wiz
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Quote:
Originally Posted by loicg View Post
After a second try, the max speed I got was much better, nearly 60 MB/sec, not more but looks fine to me.
IIRC, SuperDuper on the 2nd try is copying a lot less data, and reports the transfer higher even though the actual speed is the same. ie it's "copying" say 1 GB, but actually only copies 100 MB. Don't depend on SuperDuper's statement of effective speed.
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