Can an itunes library be duplicated, or copied from one hard

Having read through a few of your threads that focus back to these MacBook/Pro

portable model computers and their upgrade issues with High Sierra 10.3.x some

of these problems may go back to the user accounts and ownership permissions.

All calendar entries obliterated with 13.2 upgrade

Also, the ASC section named Mac Pro is specifically to intel-based tower desktop

Mac computers; akin to the older PowerMac tower that used powerPC hardware.

{As to the iTunes Store, your access there invites you to log into there to view

history and adjust your account settings. If this direction helps the above Q.}

The realization of cause and effect where permissions, privileges, and the like, are

part of a main problem when music files or drives can no longer be shared or used.

These newer macOS also brought along aspects of higher security or different methods.

Hopefully your more recent threads in these discussions will also be addressed, in so

much as contributing causes are similar across these different questions. ~ I say this

due to curiosity, I had looked into your post history; to see which Mac model you have.

In any event...

Good luck & happy trails! 🙂

Depending on where and how you look for information, and if you can

discover a way to combine the issues you've had since upgrading to

High Sierra macOS 10.13.x then you could combine tactics to resolve

an issue that seems to have its fingers into all of your Shared content.

And your externally enclosed storage drives should be adequately able

to sustain your libraries; examples such as 'owc macsales' site has are

professional level, if one looks & the costs of backups doesn't scare.

To have more than one backup, including several of the entire macOS plus

additional bootable clone of full system, is a smart move. Are you invested?

IF you and your significant other are sharing an AppleID to use content

in this latest macOS, there may be issues due to how security has been

changed since, say macOS 10.10.5, or earlier.

iTunes - Official Apple Support

Back to iTunes. This has been evolving for some time.

•iTunes for Mac: Use Multiple iTunes Libraries:

You can have more than one iTunes library. For example, you could have a library of holiday

music that wouldn’t appear in iTunes the rest of the year. Or you could keep your music in a

library on your computer and your movies in a library on an external storage device.

https://support.apple.com/kb/PH19508?viewlocale=en_US&locale=en_US

How will a Family Apple Music plan affect my personal iTunes Library?

(a discussions question-with-answers, that may affect your iTunes issues)

• iTunes for Mac: Use Home Sharing to import items from another iTunes library

• Apple Support articles:

About iTunes library files

Manage your iTunes Store account

Usage rights for iTunes Store purchases

Did you have Issues under previous older Mac OS and sought an upgrade Fix?

..Usually it's ill-advised to attempt an upgrade to try & resolve an OS issue..

[I've only had a few dozen dozen Mac computers from about 1985 to 2012

models; most not new, and learned how to repair hardware & re-install OS.]

These newer macOS, where everything is based on internet archive to restore

leaves me to wonder. ~ Only IF the internet were treated like a utility, to rely on.

In any event...

Good luck & happy computing! 🙂

First off, you should run Disk Utility and First Aid on the drive(s) that are damaged.

This may make the library usable again.

Disk Utility is in Applications > Utilities.

Connect the drive and select it from the list on the left, then click 'First Aid'.

As for moving or copying a library it's all doable.

I think. She must be logged in and using the same iTunes account as you. so whatever she is using to play the music must be on your account. Also. Have you copied the file labelled iTunes library onto the new drive.