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64 GB pro SXS cards dont mount on my desktop.. although 32 do.. 422 MXF UDF from Sony 500.. have the latest software and UDF driver.. although have never actually located where they down load to..but anyway it said down load successful.Tried new cards,new cables,and new reader.. works fine direct from camera.. and all cards etc worked fine on another older mac.. which definitely doesn't have the latest software.
To make matters weirder .. the very same cards did load before I down loaded the Sony software,but I had really slow down load speeds.. have re installed software but no cigar.. giving it till tomorrow to get any sort of answer before just buying new mac with express slot.. patience running very low.. but have at least narrowed it down to the computer..

Any idea,s

Thanks

Not the computer!! brand new 17inch MBP same deal.. all drivers installed .. 32GB looks to be fine.. but no cigar on the 64GB.. must be a software issue? No one using the 64GB card with PMW500 and MBP..?