Subject: Re: [ehci] USB-2.0 transfer rate
To: Tamas Eichkern <>
From: Petar Bogdanovic <>
List: netbsd-users
Date: 06/26/2005 03:44:40

Tamas Eichkern wrote:
 >>The results are ok, but they don't come close to the promised 480Mb/s
 >>resp. 60MB/s:
 > AFAIK these values are normal. Think about it, your memory stick and 
 > is the bottleneck here.

Definitely. I've tested my laptop-hd today and found out, that it 
reads/writes at the same speed.

And that's not surprising at all, because they are both 2.5 inch 
IDE-drives with 5400rpm.

 > For example, my fastest harddrive is capable of ~ 25
 > MiB/s, while communicating using UDMA 133, which enables 133 MiB/s
 > transfer rate, theoretically.

What do you mean with 'MiB'? MegaByte or MegaBit?

 > I really want to see a harddrive capable of 480 MiB/s :)

Take any modern IDE UDMA133-disc with 7200rpm. They read at least with 
~480Mb/s aka 60MB/s.