i have a macOS stuck on loading screen tried everything , i installed a bootable usb with yosmite but whenever i try to erase ssd drive i got the following error :

erase disk failed error : unable to write to the last block

i tried to format it in windows but got an error : Cyclic redundancy check

also checked for bad sectors using AOMEI but nothing found

  • It's entirely possible that the SSD has gone bad - which Mac do you have? Is the SSD removable?
    – Allan
    Apr 23, 2020 at 15:09
  • i installed yosmite on usb to boot from but cannot erase from diskUtility or terminal and yes SSD is removable Apr 23, 2020 at 15:10
  • See these two related answers for some possible solutions: apple.stackexchange.com/a/387460/119271 and apple.stackexchange.com/a/388362/119271. However, you may just have to replace the SSD because it's dead/dying.
    – Allan
    Apr 23, 2020 at 15:16


You must log in to answer this question.

Browse other questions tagged .