I hope the Title question says it all. There are two 'Library' directories in my OS X 10.11 installation, one being /Library/, the other being /System/Library/. What is there difference between tho. Mac os x difference between /system/library and /library.

• Photo Library Mac Not Opening

Your Photos library holds all your photos, albums, slideshows, and print projects. If your library is large, and you want to free up storage space on your Mac, turn on iCloud Photo Library and use Optimize Mac Storage, or move your library to an external drive.

Before you start, be sure to back up your library.

Prepare your drive

You can store your library on an external storage device, such as a USB or Thunderbolt drive formatted as APFS or Mac OS Extended (Journaled).¹ Find out how to check the format of your external storage device.

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Sync itunes library to iphone from mac. Sync your iPhone, iPad or iPod using your computer Learn how to sync music, films and more using your Mac or PC. Before syncing your content, consider using iCloud, Apple Music or similar services to keep content from your Mac or PC in the cloud. I have fired up an old Mac which hasn’t been used for at least 5 years in order to transfer my old iTunes library to my current iPhone 8. Both devices are connect by usb cord. When I click on devices in the iTunes library on the Mac the ‘sync’ option is grayed out. The only option is to ‘restore from backup’. Jan 16, 2020  Go to the General tab and select iCloud Music Library to turn it on. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on iCloud Music Library. If you have a large music library, it might take some time to upload and sync your music library. Jan 27, 2020  Sync your iPhone, iPad, or iPod using your computer Learn how to sync music, movies, and more using your Mac or PC. Before syncing your content, consider using iCloud, Apple Music, or similar services to keep content from your Mac or PC in the cloud. Feb 13, 2020  If you're using macOS Mojave or earlier or a Windows PC, use iTunes to sync content to your devices. Before you use iTunes to sync content to your iOS or iPadOS device, consider using iCloud, Apple Music, or similar services to keep content from your Mac or PC in the cloud.

To prevent data loss, Apple doesn't recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network.

Move your Photos library to an external storage device

• Apr 01, 2020  If you have multiple photo libraries on your Mac, you can choose one to be the System Photo Library. The System Photo Library is the only library that can be used with iCloud Photos, Shared Albums, and My Photo Stream.
• Jul 12, 2017  To move our Photos Library, we drag it to its new location, double-click it, and the Photos app will now point to it. So, that was pretty easy. We’ll next show you how to create a completely new System Photo Library. Creating a New System Photo Library. There are any number of reasons you might want to create a new system library in Photos.
• May 07, 2015  A window will pop up with a number, which in my Mac’s case was over 236GB between a number of different photo libraries — Apple’s Photo Booth, Aperture, iPhoto, and Photos, just to name a.
• Jan 13, 2020  Use Photos on your Mac. Photos helps you keep your growing library organized and accessible. Powerful and intuitive editing tools help you perfect your images. Memories displays the best images from your photo library in beautiful collections. And with iCloud Photos, you can keep a lifetime’s worth of photos and videos stored in iCloud.

1. Quit Photos.
2. In the Finder, go to the external drive where you want to store your library.
3. In another Finder window, find your library. The default location is Users > [username] > Pictures, and it's named Photos Library.
4. Drag your library to its new location on the external drive. If you see an error, select your external drive's icon in the Finder, then choose File > Get Info. If the information under Sharing & Permissions isn't visible, click , then make sure the 'Ignore ownership on this volume' checkbox is selected. If it's not selected, click to unlock it, enter an administrator name and password, then select the checkbox.²
   
   
5. After the move is finished, double-click Photos Library in its new location to open it.
6. If you use iCloud Photo Library, designate this library as the System Photo Library.

Delete original library to save space

After you open your library from its new location and make sure that it works as expected, you can delete the library from its original location.

In a Finder window, go back to your Pictures folder (or whichever folder you copied your library from) and move Photos Library to the trash. Then choose Finder > Empty Trash to delete the library and reclaim disk space.

Open another Photos library

If you have multiple libraries, here's how to open a different one:

1. Quit Photos.
2. Press and hold the Option key while you open Photos.
3. Select the library that you want to open, then click Choose Library.

Photos uses this library until you open a different one.

Learn more

If you have a permissions issue with your library, you might be able to resolve the issue by using the Photos library repair tool.

1. You can't move your library to a disk that's used for Time Machine backups.

Photo Library Mac Not Opening

2. If the volume isn't formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn't been erased, this checkbox will either not be present, or won't be selectable after unlocking. Erase and reformat the drive for this option to be available.