Abstract: In accordance with an embodiment, a drive motor includes a carrier comprising a lens installation hole configured to have an optical lens installed therein; a coil located on an outer side of the carrier; and a coil heat dissipation structure located between the carrier and the coil, wherein the coil heat dissipation structure is fastened to the carrier, and the coil is fastened to and is in thermal conduction with the coil heat dissipation structure.

Abstract: To manage expired backups in a storage system, a backup server retrieves multiple deletion logs which record invalid data included in one or more expired backups. When a deletion condition is met, the backup server identifies a first large object based on the multiple deletion logs, and sends a data migration request to an object-based storage system to instruct the object-based storage system to copy valid data of the first large object to a second large object. Thereafter, the backup server sends an object deletion request to the object-based storage system to instruct the object-based storage system to delete the first large object, thereby clearing up the expired backups.

Abstract: In a data restoration method and apparatus, after a data restoration request is received, all metadata corresponding to each deduplication index is determined based on a deduplication index corresponding to metadata of each data slice in backup data. Then, the data slice is stored to a distribution location described in each piece of metadata corresponding to the deduplication index.

Abstract: To manage expired backups in a storage system, a backup server retrieves multiple deletion logs which record invalid data included in one or more expired backups. When a deletion condition is met, the backup server identifies a first large object based on the multiple deletion logs, and sends a data migration request to an object-based storage system to instruct the object-based storage system to copy valid data of the first large object to a second large object. Thereafter, the backup server sends an object deletion request to the object-based storage system to instruct the object-based storage system to delete the first large object, thereby clearing up the expired backups.

Abstract: In a data restoration method and apparatus, after a data restoration request is received, all metadata corresponding to each deduplication index is determined based on a deduplication index corresponding to metadata of each data slice in backup data. Then, the data slice is stored to a distribution location described in each piece of metadata corresponding to the deduplication index.