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Catalogs
Each time a tape is mounted, Canister will create a Catalog for it. Canister Catalogs are special folders containing tiny stubs for each file on your tape, and mount as a read-only virtual drive each time Canister opens.

LTO Archive

When Canister is open, all Catalogs are available as a virtual drive called LTO Archive. Since a driver installation is required, Canister will prompt you for the install. If not, download the installer directly from our servers. To access catalogs without a virtual drive, Alt-Click the Catalog icon in Canister (top-right).

Catalog History

Canister creates a Catalog when mounting a tape and updates it after each Archive. Old Catalogs are moved into a hidden folder named LTO Tape (serial).history, essentially archiving them as well.
To see previous generations of your Catalogs, enable Show Hidden Files in Finder with the shortcut Shift-Command-.

Editing and removing Catalogs

To clean up the Catalog, or remove for instance test entries, you can open the original location where the stubs are saved by Alt/Option-Clicking the Catalog icon in Canister. This will open Finder in ~/Library/Application Support/Canister/Catalogs.

Retrieving files using Catalogs

Currently, it's not possible to use Catalogs to tell Canister which files to retrieve. This feature is on the roadmap, together with the importing and exporting of Catalogs.