HT1452 I have a Toshiba Canvio 1TB external hard drive on my Mac. I've used it for 4-5 months with no problems, but now cannot add to it (I use it mostly for photo storage) to it. I can still access information previously added. Ideas?

I have a Toshiba Canvio 1TB external hard drive on my Mac. I've used it for 4-5 months with no problems, but now cannot add to it (I use it mostly for photo storage) to it. I can still access information previously added. Ideas?

I cannot find this 300GB "Backup" in the Finder, only in the Storage info when I check "About This Mac".
You are probably using Time Machine to backup your MacBook Pro, right? Then the additional 300 GB could be local Time Machine snapshots.  Time Machine will write the hourly backups to the free space on your hard disk, if the backup drive is temporarily not connected. You do not see these local backups in the Finder, and MacOS will delete them, when you make a regular backup to Time Machine, or when you need the space for other data.
See Pondini's page for more explanation:   What are Local Snapshots?   http://pondini.org/TM/FAQ.html
I have restarted my computer, but the information remains the same. How do I reclaim the use of the 300GB? Why is it showing up as "Backups" when it used to indicate "Photos"? Are my photos safe on the external drive?
You have tested the library on the external drive, and so your photos are save there.  
The local TimeMachine snapshot probably now contains a backup of the moved library.  Try, if connecting your Time Machine drive will reduce the size of your local Time Machine snapshots.

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