I also have the same issue....this must be happening to a few people but haven't found any info yet on how to get back to write mode.
I have tried Windows explorer right click - format, just hangs explorer,
have tried Easeus partition manager and it doesn't even want to see the disk,
also tried easeus data recovery manager and can copy off the files off disk, but still does not recover partition,
tried a program called testdisk, which sees the disk, but cannot format, delete partition, or change the r r r settings to also let it write.
Anyone found a solution yet other than take back to manufacturer?