computerlarry
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USB Drive doesn't automatically mount when connected to MacBook Pro 10.11.6, but can be mounted using Disk Utility
User's USB external drive does not automatically mount when connected to a MacBook Pro
When I run Disk Utility, I am able to get the drive to mount after I run disk repair, and then automatically mount.
Disk Utility shows that the drive is in the unmounted state after being connected to the MacBook Pro
What could be preventing the mounting?
Is a Mac OS upgrade required?
Is the drive damaged?
Are the Mac's USB ports a problem?
User has a MacBook Pro with Mac OS X 10.11.6
MacBook Pro Retina 2.2GHz Intel i7 - Mid 2014
16 GB RAM
Backup drive is Seagate Ultra Slim PL Media
1 TB, USB connection
Partition Map is Master Boot Record
Time Machine accepted this MBR drive as a backup drive
Would MBR partition keep the drive from being mounted?
When I run Disk Utility, I am able to get the drive to mount after I run disk repair, and then automatically mount.
Disk Utility shows that the drive is in the unmounted state after being connected to the MacBook Pro
What could be preventing the mounting?
Is a Mac OS upgrade required?
Is the drive damaged?
Are the Mac's USB ports a problem?
User has a MacBook Pro with Mac OS X 10.11.6
MacBook Pro Retina 2.2GHz Intel i7 - Mid 2014
16 GB RAM
Backup drive is Seagate Ultra Slim PL Media
1 TB, USB connection
Partition Map is Master Boot Record
Time Machine accepted this MBR drive as a backup drive
Would MBR partition keep the drive from being mounted?
ASKER
I bought a Windows formatted drive, and then used the Mac OS Disk Utility to re-format as a Mac HFS+, but I see that the drive is currently a MBR. I'm thinking that the Mac OS might have made the drive a MBR when I agreed to use the drive for Time Machine
I do not have this problem, but I put an HFS+ partition on the NTSF (originally) drive. But that must have been done already if Time Machine accepts the drive. So it should mount. But you can always do this:
How to "force" a drive mount "automatically":
Now reboot and see if that works. I have not done that in years, but it should be a workaround.
How to "force" a drive mount "automatically":
- Mount the drive using Disk Utility
- Launch System Preferences
- Select the Users & Groups preference (called Accounts in earlier versions of the Mac OS)
- Click on the Lock icon, enter your user name and password, and click Unlock.
- Now click on the Login Items tab to open it.
- Drag the icon of the mounted drive into the list of login items.
- Find it in the list and check the box on the right to tell the system to mount the drive.
- Close.
Now reboot and see if that works. I have not done that in years, but it should be a workaround.
ASKER CERTIFIED SOLUTION
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I am still unsure as to what the in the answers provided by Eoin solved your issue. Can you explain so we all know what you found? Thank you.
Windows NTFS partitions can be mounted on Macs but you need the Seagate free version of NTFS for OS X, or pay for the full Paragon NTFS. If it's NTFS, you should check the NTFS for OS X preferences to be sure it wasn't turned off. Macs can read NTFS, but writing is turned off by default. You have to enable writing or use a driver.