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:
looks like the Write speed is 45 mb/sec:
sony itself claims its writing speed of 45 mb/s. click the link or copy paste it.
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