Which of the following is not a data sanitization type but a process to reduce seek times on a hard drive?

Disk defragmentation is a process aimed at improving the performance of a hard drive by reorganizing the data layout. Over time, as files are created, modified, and deleted, they often become fragmented, meaning that pieces of the same file are scattered across different sectors of the drive. This fragmentation can lead to slower access times, as the read/write heads have to move to various locations on the disk to access each piece of a file. Running a disk defragmentation process reorganizes these files so that they are stored in contiguous blocks, thereby reducing seek times and improving overall data retrieval efficiency.

In contrast, the other options listed are methods specifically designed for data sanitization, which ensures that sensitive data is effectively and permanently erased from storage media to prevent unauthorized recovery. For example, a quick format does not truly erase the data but rather marks the storage space as available for new data without actually overwriting it. Purge and crypto erase are methods that go further in ensuring that the data cannot be recovered by making it irretrievable either by overwriting information or by encrypting data in such a way that only authorized access is possible.