Writing video files (.mkv) = 52.5 MB / s (53 MB / s with SD adapter) Writing mp3 files = 37.2 mb / s (43 MB / s with SD adapter) . Playing video files (.mkv) = 65.3 MB / s (66 MB / s with SD adapter) Playing mp3 files = 61.4 mb / s (67 MB / s with SD adapter) . Test made in Windows 7 with a card reader Transcend TS-RDF5K connected in USB3.0, with FAT32 formatted card. . This 32GB card (actual 29.7 GB) purchased for use in a digital camera Canon 240HS via the micro SD adapter makes its job perfectly. It is announced by Sandisk for read speeds / write 60/40, so the contract is completed. . Note that a code is provided for use during 1 year of software "pro rescue deluxe".