I too was plagued by this error message immedialy after upgrading my S5 to a new S9. I had my previous 64G SD for about a year. Not a single issue in my S5. Moved it to my S9 and everything seemed fine for week or so. Then the errors started on and off for a few days. Eventually they became a daily occurance. I've read all the complaints and I agree buying a new phone and immediatly having issue with your SD card is annoying. Escpecially if you have been error free for a long long time. I removed my 64G SD and placed it into my PC to copy all of the files to the harddrive. Low and behold there are errors on the SD card that were not present when the card was in my S5. The errors became apaprent when I could not transfer some pictures and files from the drive. I copied off all I could by excluding those erronious files and I replaced the SD card with a new 64G SD card and the issues have gone. Same manufacturer, same size, DIFFERENT specifications. Now for something I have not seen in another post yet.... Then again I have not read ALL the SD error posts... When replacing my 64G SD card there are difference Classes and different U ratings... My old SD card was a Class 10 card but it did not have a U rating, so I am assuming U1. The new card I purchased is a Class 10 with U3 rating. U1 means that it is guaranteed to transfer at a minimum of 10 MB/s whereas U3 it's guaranteed to transfer at a minimum of 30 MB/s. The new S9+ camera can record 4K UHD video and that requires a minimum of a 30MB/s transfer rate according to Sandisk. I wonder if our older trouble free cards get corrupted by the OS constantly driving all read/writes, not just the video capture, at the 30MB/s? Would be interesting to hear if everyone who is having the SD card error issues has purchased a U3 or higher SD card. Wondering if Samsung has SD card specification that needs to be notated for U3 for the S9+.
... View more