Administration

Your operating system will have some kind of drive management. Find this now. You should find a new drive, with almost the sum total capacity of the cards you used. For instance, four 128 gigabyte SD cards will create a drive of about 500 GB.

Think carefully. This is your last chance. Is there anything on any of the cards that you want to keep? If so, turn off the machine, remove the card and copy the data to a safe place.

You may now format the drive. Because of the way Solid State Drives work, there is an advantage to not using the full capacity. For instance, if you have 500 GB available, formatting to only 450 GB will mean the drive will last longer. The "unused" part will be used by the drive to share out the wear with the other parts of the drive.