On 2/16/2011 9:52 AM, Chuck Norcutt wrote:
> You're running at approximately 12 M bits/sec. which is close to the
> theoretical max for USB 1.1. But no USB 1.1 device could go that fast in
> practice so you likely have an early USB 2.0 device (in your computer) with a
> performance problem. A USB 2.0 device should be able to hit 8-30 M *bytes*
> (not bits).
Remember, there was a compromise in the standard when USB 2.0 started. The base
spec was hardly better than 1.1. Only
"HiSpeed" USB 2.0, which was introduced with a special logo, is actually fast.
A lot of early USB 2.0 gear is stone slow.
The HiSpeed USB 2.0 readers I have that look just like the USB 3 one Mike
linked to have an actual read speed on my
computer of 18-20 MB/sec. with 4GB Extreme III cards. That translates to about
25 minutes for 28 GB.
> Your proposed solution is a USB 3.0 device but it's an external device.
USB 3 devices are supposed to be fully backward compatible with USB 2, so a 3.0
reader should work fine on an existing
2.0 HiSpeed USB port, just at the lower speed.
> You still need a USB 3.0 device in the computer to make this work. You need
> an adapter card to provide a place to plug this in. Possibly even a cable
> too. I haven't investigated the particulars.
Yup, special cables are required to assure the full "Super Speed".
If the computer has HighSpeed 2.0, I'd just get a cheap HS 2.0 reader for now.
Well, I did. . .
Moose
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