1. sjms says

    in the spec info they give only the read speed which is how it is rated these days. this is the easiest thing for a card. the write speed on the other hand is not even eluded to. most cards except for a select few write at considerably lower rates due to the energy consumption level. half the equation does not tell the whole story.

    this is about all that I could find on the sony site:,61379,61382,72494/c/65,66/kw/sd%20cards