Một tập tin THUMBBDATA-17638120 là một tập tin dữ liệu do ứng dụng Gallery được tạo ra cùng với một ứng dụng Android được chọn, như là Sony Xperia và HTC Desire SV.Nó chứa tính chất của mỗi ảnh mẫu được sắp xếp bởi ứng dụng Gallery để giúp nó tải các ảnh nhanh hơn.

The THUMBDATA3-1763508120 file is created by the Gallery app to cache information about images that have been indexed. The caching helps the Gallery app load images quicker and reduce lag time when displaying thumbnails. The more images you have in the Gallery app, the larger the THUMBDATA3-1763508120 file size. It may become several GBs in size if you have a large number of thumbnail images in your Gallery app. The file increases in size every time a new image is added. Also, when an image is deleted the indexed properties of the image still remain. To reduce the THUMBDATA3-1763508120 file size, you need to remove images from the Gallery app then delete the THUMBDATA3-1763508120 file. The file will be regenerated by the Gallery app but only for the images still in the app. You can use an Android file manager to navigate to your thumbnail index files, which can be found in the sdcard/DCIM/.thumbnails directory. NOTE: The THUMBDATA3-1763508120 file is commonly found with the .THUMBDATA3-1967290299 file.