G
GK
I have a Sony DSC-V1 digital camera (prescribed as "USB-2 high speed")
with a Sandisk 256MB memory stick pro-duo that I have hooked up to
several different USB-2 capable PCs, some Intel, some nVidia chipsets
(all of which have been Win2k-SP4) and am only seeing download transfer
rates of around 12Mbps.
After a lengthy dialogue over several months with Sony support that
involved verifying my PC hardware, software and drivers, they have
finally come back with the explanation that the camera itself only
supports discrete transfer rates, fixed at 3, 5, 12 and 480Mbps!!
Therefore any memory stick media with read/write speeds unable to
support in excess of 480Mbps will cause the camara to throttle the rate
back to a maximum of 12Mbps (USB-1 spec)!!
The upshot of this undocumented feature of course would be that there is
absolutely no benefit in purchasing any of the faster (and more
expensive) memory stick media such as pro and pro-duo (apart from using
a USB2 card reader of course). I also am a bit wary of their
explanation due to the fact that they spent so long emailing back and
forth and getting me to verify my setup before finally resorting to that
explanation.
My question to the collective is - have any of you with similar
equipment, perhaps with a different OS, seen transfer rates in excess of
12Mbps that suggest USB-2 compliance? (I'd have expected at least
50Mbps, with a theoretical limit at 160Mbps), or do you have any other
reasons to believe that their explanation is in fact nonsense?
Cheers,
Graeme.
with a Sandisk 256MB memory stick pro-duo that I have hooked up to
several different USB-2 capable PCs, some Intel, some nVidia chipsets
(all of which have been Win2k-SP4) and am only seeing download transfer
rates of around 12Mbps.
After a lengthy dialogue over several months with Sony support that
involved verifying my PC hardware, software and drivers, they have
finally come back with the explanation that the camera itself only
supports discrete transfer rates, fixed at 3, 5, 12 and 480Mbps!!
Therefore any memory stick media with read/write speeds unable to
support in excess of 480Mbps will cause the camara to throttle the rate
back to a maximum of 12Mbps (USB-1 spec)!!
The upshot of this undocumented feature of course would be that there is
absolutely no benefit in purchasing any of the faster (and more
expensive) memory stick media such as pro and pro-duo (apart from using
a USB2 card reader of course). I also am a bit wary of their
explanation due to the fact that they spent so long emailing back and
forth and getting me to verify my setup before finally resorting to that
explanation.
My question to the collective is - have any of you with similar
equipment, perhaps with a different OS, seen transfer rates in excess of
12Mbps that suggest USB-2 compliance? (I'd have expected at least
50Mbps, with a theoretical limit at 160Mbps), or do you have any other
reasons to believe that their explanation is in fact nonsense?
Cheers,
Graeme.