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chap
07-13-2007, 09:57 AM
Hello,

I'm trying to use SuperDuper! to backup to a USB2 drive from my MacBook Pro. When doing a full backup to the drive (not to an image) SD! reports a copy speed of around 0.5MB/s. I've let it run for quite some time and the speed does not improve. To rule out the speed of the USB disk I tried using Finder to copy some files. Finder copies 4GB in around a minute (giving a speed of about 53MB/s).

Is there some reason SD! would run so much slower? Is there anything I can do to speed this process up?

Thanks,
Chap

dnanian
07-13-2007, 10:16 AM
Sounds like the drive really isn't running HiSpeed, Chap. Is that the only thing attached to USB?

chap
07-13-2007, 10:38 AM
Sounds like the drive really isn't running HiSpeed, Chap. Is that the only thing attached to USB?

Thanks for the reply. When I was running this the drive was the only device connected via USB. I'm pretty sure the drive was running HiSpeed because the copy from Finder was at a much, much higher speed than the SD! backup.

I searched the forums for similar posts to try to narrow the problem down further. I was running an erase and copy to the drive itself, not an image, so comparison and compression time should not be an issue. I also closed all programs other than SD!.

I appreciate any help you can provide.

Thanks,
Chap

dnanian
07-13-2007, 10:40 AM
We're using standard calls to write to the drive; they go as fast as they can. If you're getting super slow speeds, it's because something is causing that -- although it's hard to judge Finder vs. a SD copy because the SD! copy is going to start out copying a zillion teeny files, and you likely streamed something large...

patso23
08-21-2007, 08:29 PM
We're using standard calls to write to the drive; they go as fast as they can. If you're getting super slow speeds, it's because something is causing that -- although it's hard to judge Finder vs. a SD copy because the SD! copy is going to start out copying a zillion teeny files, and you likely streamed something large...


I'm having the same problem. I'm using one of the Lacie USB2 drives (the FA Porsche designed model) and am currently only getting a copy speed of around 2 MB/s.....

I'm also using a macbook pro, and I'm sure that the drive is hispeed because in the system profiler it is listed as:
Speed: Up to 480 Mb/sec

What could be causing this issue? Thanks.

Patso

dnanian
08-21-2007, 08:40 PM
Slow speeds are caused because either the source or destination drives aren't running quickly (for whatever reason), or because of software interference (e.g. AntiVirus).

yashrg
10-31-2007, 09:29 AM
also, remember to turn off spotlight indexing manually during this time. and add the backup drive to the privacy list just to be extra sure.