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Groups > comp.sys.mac.hardware.storage > #1521

Re: Unble to boot from a couple 64 GB USB flash drive with mac OSes?

Cross-posted to 2 groups.

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In comp.sys.mac.hardware.storage David Empson <dempson@actrix.gen.nz> wrote:
> Ant <ANTant@zimage.com> wrote:

> > Hello.
> > 
> > In a 13.3" 2012 MacBook Pro (MBP) with its old updated Mac OS X/Mountain
> > Lion v10.8.5, I used https://support.apple.com/en-us/HT201372's 
> > instructions to make a bootable Mac OS (v10.12.4 Sierra and v10.11.6 El
> > Capitan from App Store) onto a 64 GB PNY flash drive. I saw no errors
> > after several minutes.

> "After several minutes"? You need to let it run to completion, which
> will probably take ten minutes or more. It is finished once the command
> prompt returns, after which you can eject the drive.

No, it was done. It took several minutes to complete all that.


> > When I reboot/power up this MBP and hold down its C key to boot from it,
> > I get its light gray screen for about a minute and then it takes to its
> > internal SSD's old Mac OS X's FileVault login screen.
> >
> > I tried two different 64 GB USB PNY flash drives. How come it didn't work?
> > I don't have another Mac at the moment to try on. I can see the contents
> > on the flash drive though in Finder.

> On Macs with an optical drive, the C key boots from that is used to boot
> from the optical drive (C for "CD" is the original reason that key was
> chosen).

> To boot from a USB flash drive on that model on a one-off basis, you
> need to hold down the Option key at startup, which brings up a boot disk
> selector screen with an icon for each bootable device found. You can
> then choose the USB flash drive with the mouse or arrow keys, and click
> or press Return to boot from it.

Ah, Option key worked. https://support.apple.com/en-us/HT201255 is 
confusing with its "Start up from a bootable CD, DVD, or USB thumb drive 
(such as macOS install media)." :(


> > Also, its Startup showed nothing bootable from this drive. Maybe the
> > bootable part failed or something?

> That description was a bit mangled: did you mean that the flash drive
> doesn't show up in System Preferences > Startup Disk?

Yeah, sorry. I fixed it above. I forgot to proofread that part. ;)



> If so, you probably did something wrong in the process of using the
> createinstallmedia tool. It should show up as a bootable device.

Nah, that part worked since it said "done" at the end. C doesn't boot 
it, but Option key did.
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Unble to boot from a couple 64 GB USB flash drive with mac OSes? ANTant@zimage.com (Ant) - 2017-03-31 20:44 -0500
  Re: Unble to boot from a couple 64 GB USB flash drive with mac OSes? dempson@actrix.gen.nz (David Empson) - 2017-04-01 15:53 +1300
    Re: Unble to boot from a couple 64 GB USB flash drive with mac OSes? ANTant@zimage.com (Ant) - 2017-03-31 21:56 -0500
      Re: Unble to boot from a couple 64 GB USB flash drive with mac OSes? dempson@actrix.gen.nz (David Empson) - 2017-04-01 16:43 +1300

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