There is something I am trying to understand about the Mac OS.
I have a MacBook Pro from late October, 2011. It runs Sierra 10.12.6, and I believe it is the latest OS this machine is capable of running. It currently has a newly installed 1TB hard drive. The original 500GB SATA 7200 RPM hard disk was installed to a USB enclosure so that I had easy access to my old drive and any files it contained.
For a while, this worked fine.
I tried plugging it in yesterday and while the drive activity light blinks, it does not appear in the sidebar. Disk utility does see it and I have tried un-mounting and remounting. But when I try un-mounting in disk utility, I receive a message stating it can't un-mount the drive because it is in use.
This has happened to 3 USB flash drives and now the old drive currently in the USB enclosure.
This is particularly puzzling because it is an Mac OS drive.
So why the sudden loss of access? Can I regain access without formatting the drive?
I have a MacBook Pro from late October, 2011. It runs Sierra 10.12.6, and I believe it is the latest OS this machine is capable of running. It currently has a newly installed 1TB hard drive. The original 500GB SATA 7200 RPM hard disk was installed to a USB enclosure so that I had easy access to my old drive and any files it contained.
For a while, this worked fine.
I tried plugging it in yesterday and while the drive activity light blinks, it does not appear in the sidebar. Disk utility does see it and I have tried un-mounting and remounting. But when I try un-mounting in disk utility, I receive a message stating it can't un-mount the drive because it is in use.
This has happened to 3 USB flash drives and now the old drive currently in the USB enclosure.
This is particularly puzzling because it is an Mac OS drive.
So why the sudden loss of access? Can I regain access without formatting the drive?
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