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vprunes 03-09-2008 01:02 PM

2.75mb/s back up speed

Newbie question:

Bought an iomega 500gb usb hard disk and using super duper trial version (i I intend to buy after to activat smart update) am trying to do my first back up to a partition formatted using disk utility in correct format.

The transfer rate is 2.75 mb/s

I've looked through the posts and found one where 8mb/s is considered slow.

On the box the doc says USB transfer 480 mb/s

Is this normal ? Should I stop the back up ?



dnanian 03-09-2008 08:44 PM

It's 2.75MB/s, not Mb/s. 8x difference there, Simon. USB's speed, though, is a protocol level streaming speed, and is never really reached in practice.

supermonkey 05-13-2008 07:29 PM

Im having the same problem. SuperDuper is transferring at 3.54 MB/sec. I know USB 2.0 is rated at 480 Mb/sec, but thats 60 MB/sec max. In realy life you dont get this of course, but I should be getting at least 20-30 MB/sec.

Any ideas?

dnanian 05-13-2008 07:35 PM

4-6MB/s is what I'd expect over USB, actually... remember, tiny files, their directory information, metadata, etc are being copied. Much slower than a big streamed file.

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