# Why Are Fragments Generated?

Fragments are incomplete data in buckets generated due to data upload failures.

Data can be uploaded to OBS using multipart uploads. Fragments are generated, if a multipart upload fails because of the following reasons (included but not limited to):

- The network is in poor conditions, and the connection to the OBS server is interrupted frequently.
- The upload task is manually suspended.
- The device is faulty.
- The device is powered off suddenly.

Parent topic: How Do I Use Fragment Management?