![macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different](https://i.stack.imgur.com/UrRBV.jpg)
macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different
![First Aid process has failed, if possible back up the data on this volume. ERROR Fix | Mac - YouTube First Aid process has failed, if possible back up the data on this volume. ERROR Fix | Mac - YouTube](https://i.ytimg.com/vi/pvo54n4jRp4/maxresdefault.jpg)
First Aid process has failed, if possible back up the data on this volume. ERROR Fix | Mac - YouTube
![macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different](https://i.stack.imgur.com/CkUPi.jpg)
macbook pro - External Hard Disk Problem - doesn't mount / can't first aid / can't erase using disk utility - Ask Different
![First Aid process has failed, if possible back up the data on this volume. ERROR Fix | Mac - YouTube First Aid process has failed, if possible back up the data on this volume. ERROR Fix | Mac - YouTube](https://i.ytimg.com/vi/pvo54n4jRp4/mqdefault.jpg)