Macbook Pro not detecting full SSD capacity
Hello Guys, i have installed a used 256gb SSD to my Macbook Pro 2012. Now when I boot my system via recovery disk it shows on 8.13 GBs and not 256. I tried booting it with the old SATA as external drive; it worked but now i am unable to see the installed SSD at all. Disk utility is only showing external drives. No idea what to do. please help.
MacBook Pro 13", macOS 10.15