Please run First Aid to repair your USB flash drive:
Reason 2: Improper Finder Preferences Settings When find your flash drive doesn't appear on Mac after connection, you should first do the following things:
The broken cable/port, or insufficient/unstable power supply could make your Mac not recognizing USB. You can find data recovery tool designed for Mac and Windows platforms easily on the internet.įree Download Reason 1: Connection ProblemĬonnection issue is one of the most important reasons why your USB drive not showing up Mac. command: $ bless -info /Volumes/Install\ OS\ X\ Yosemite/įinderinfo: 597 => Blessed System Folder is /Volumes/Install OS X Yosemite/.IABootFilesįinderinfo: 615 => Blessed System File is /Volumes/Install OS X Yosemite/.IABootFiles/boot.efiįinderinfo: 0 => Open-folder linked list emptyįinderinfo: 0 => No alternate OS blessed file/folderįinderinfo: 597 => OS X blessed folder is /Volumes/Install OS X Yosemite/.Tip: Please take actions immediately to recover data from your USB drive when it becomes abnormal. You can check the screenshot to confirm though. Here is a screenshot of the "Startup Disk" option within "System Preferences" on my working MBP that has the Bootable USB plugged in - which proves that it was properly created, I believe. The below screenshot shows EFI in Debug mode in Disk Utility.įor what it's worth, when I plug in this drive into my working MBP, I see the "Install OS X Yosemite" get mounted in Finder. Not sure how to tell if it is a Boot disk or not. Specifically choice number 1, where I downloaded the OS from the App Store and ran the terminal commands on a pre-formatted USB drive.īelow you will see the Disk Utility for the USB drive. I made the USB Boot drive from this guide: I have already successfully backed up my files. How do I either boot to my USB, or just get a restore done? I am concerned that the HD may be dead/dying, but I don't want to jump to that conclusion yet. When I try to run recovery, it runs for a little and then goes to a "no" symbol, with the spinner still spinning. The only drives I see when holding down option are Macintosh HD and Recovery.
Per Apple, this is my machine: MacBook Pro (13-inch, Mid 2009) It is the full body aluminium with the Superdrive. When I hold option during Boot, the USB drive doesn't show up on the menu. I created a Yosemite boot USB, from the App Store version 10.10.1.
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