I purchased the Samsung 512GB Pro Ultra as an add on to my Budi (upgrade) portable storage drive. I connected it to my Windows 10 Pro PC to test and it was detected. I copied a 434 MB video file in just a quick couple of seconds. For a 15.5 GB file, it took about 6 minutes with an average write speed of 36 MB/s. I compared it with an 512 GB, SD Extreme card. I copied a 72 GB video file. Both max write speeds were about 37 MB/s. Copy time was around 30 minutes. This card is good, it's write speed for large files are about the same the leading brand with similar features.

This product fails miserably to deliver expected high speed transfers. Samsung claims file transfer speeds are UP TO 130 Mb/s. Technically, this is true, but only because any number between 0 and 130 can be considered UP TO 130. The reality from my experience is a high of 23 Mb/s, an alarming 107 Mb/s slower than the potential highest speed. Yes, I know many factors have to be considerd - internet connection, computer,etc. While my setup is far from superlative, it is certainly capable of file transfer speeds of up to 130 Mb/s. I use a Lenovo IdeaPad 3. Connection is Xfinity Broadband with speeds up to 300 Mb/s. My computer and one mobile phone are the only devices connected to the network. One star out of five is a generous rating - 20 percent of a perfect five ... MoreThis product fails miserably to deliver expected high speed transfers. Samsung claims file transfer speeds are UP TO 130 Mb/s. Technically, this is true, but only because any number between 0 and 130 can be considered UP TO 130. The reality from my experience is a high of 23 Mb/s, an alarming 107 Mb/s slower than the potential highest speed. Yes, I know many factors have to be considerd - internet connection, computer,etc. While my setup is far from superlative, it is certainly capable of file transfer speeds of up to 130 Mb/s. I use a Lenovo IdeaPad 3. Connection is Xfinity Broadband with speeds up to 300 Mb/s. My computer and one mobile phone are the only devices connected to the network. One star out of five is a generous rating - 20 percent of a perfect five star rating. The product itself delivers less than 18 percent of its alleged potential (17.69 percent of its alleged top speed). I am impressed by the enormous storage capacity (477 GB) but that is overshadowed by its dismal speed performance. Overall, performance was most important to me with this product, far outweighing features and design, resulting in a deserved one star rating. I will credit Samsung for its phrasing of "UP TO" involving transfer speed. It is not a lie, it's just unlikely to happen. In the same context, everywhere is within walking distance if you have the time.

Bought 2 x 512Gb EVO Select cards for my recently purchased Galaxy A15 cell phone and Galaxy S6 Lite tablet. Neither cards were recognized in either device so couldn't reformat or anything! Tried numerous options, forced restart etc, nothing worked. Ended up having to reformat the cards in my Tapo security cameras (LOL) before they were recognized by the Samsung devices... When I inserted one of my 256Gb EVO Select cards into both devices to test (phone and tab) they were instantly recognized. Would suggest a format issue from Samsung.