I am not satisfied with this advice, There is no fault whatsoever with my SD memory card as it works perfectly well in another device.
I reserve my right to a refund from Just Answer.
I can accept that your sd card works in other devices, but I do not know that it can be filled to more than half capacity. You could test that, by transferring enough files onto it temporarily to at least partially fill the upper half of its memory. It does not matter what those files are, as long as they can be copied successfully. They can be deleted from the sd card afterwards. This can be done in your phone, by using the usb cable to connect it to your computer, or it can be done in another device.
My SD card is working with the same amount of data as was on it before.
I understand what you are saying. However as far as I can see there is nothing wrong with the SD card.
Have you done the test that I have recommended to see if the memory will hold more data than it shows in your phone? How much data were you able to copy onto the card using your computer?