DVD Speed

When using "DVDSHRINK" the speed when reading a DVD from a USB
DVD/reader/writer is twice as fast as reading from an internal DVD/reader
and DVD/reader/writer

Is there any reason for this?

Thanks a Lot

IAN

well is the speed rated higher on the usb dvd
"IAN" <bigsil@powerup.com.au> wrote in message
news:47800bb5$0$11995$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> When using "DVDSHRINK" the speed when reading a DVD from a USB
> DVD/reader/writer is twice as fast as reading from an internal DVD/reader
> and DVD/reader/writer
>
> Is there any reason for this?
>
> Thanks a Lot
>
> IAN
>