Share your experience!
On two Win7 64bit computers I can connect to the external SD but on my notebook the drive won't show up. Any ideas what this can due to?
do you have PC companion or Sony Update Service or Flashtool installed?
try installing the drivers manually.
http://developer.sonymobile.com/downloads/drivers/xperia-p-xperia-u-and-xperia-sola-drivers/
also try using other ports.