The user reports that enabling the "Always search file names and contents" feature causes their C drive to fill up completely during searches. ChatGPT explains that this issue is due to the indexing service scanning too many files, leading to high disk space consumption, and provides multiple solutions such as limiting indexed locations, adjusting settings, excluding large files, and rebuilding the index. Overall, the thread offers practical advice to manage Windows Search indexing and prevent excessive disk usage when using this feature.