# Scratch Pools (Media Group)

A scratch pool is a repository of media that are available for use. When a data protection, synthetic full, or auxiliary copy operation requires new media, the software uses one media from a scratch pool.

Media may be:

- Assigned to a scratch pool when they were imported and discovered in the CommCell environment.

- Logically reassigned from one scratch pool to another scratch pool.

- Returned to a scratch pool by the software when all of its data are pruned or deleted.

Every library has a default scratch pool (Spare Media Group/Pool), which is automatically created when the library is configured. When you create a storage pool for the library like when the library or one of its drive pools is configured, the primary copy is associated with the default scratch pool. In addition, when you import new media into the library, they are assigned to the default scratch pool. You can create any number of additional scratch pools, and assign these to different storage copies that access the library.

Note

Each storage pool is linked to a scratch pool that contains available media. Copies associated with a storage pool automatically use the media from the scratch pool linked to that storage pool.

If you want a copy to use dedicated media instead of shared media, follow these steps:

1. Create a new scratch pool and move the desired media into it.
2. Associate the scratch pool with a new storage pool.
3. Create a copy to use the above storage pool.

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