.THUMBDATA4--1967290299 File Extension
Android Gallery Thumbnail Index
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What is a THUMBDATA4--1967290299 file?
A THUMBDATA4--1967290299 file is a data file created by the Gallery app included with select Android phones, such as Sony Xperia and Samsung J7. It contains information about every thumbnail image Gallery has indexed, to help the app load the images more quickly. THUMBDATA4--1967290299 is stored in a device's hidden .THUMBNAILS folder, which is visible only when you've chosen to show hidden files and folders on your device.
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Gallery uses THUMBDATA4--1967290299 to cache information about images it has indexed. This caching helps Gallery load images more quickly and reduces lag time when displaying thumbnails.
The more images you have in your Gallery app, the larger THUMBDATA4--1967290299 grows. If you have a large number of thumbnail images in Gallery, your THUMBDATA4--1967290299 may become several hundred MBs or even several GBs in size. The file increases in size every time a new image is added. Also, when you delete an image, that image's indexed properties remain in the file.
To reduce a THUMBDATA4--1967290299 file's size, remove images from your Gallery app and then delete the THUMBDATA4--1967290299 file. Gallery will automatically regenerate the file, but the file will contain data for only the images still in the app.
If you do not want to remove images from your device, delete THUMBDATA4--1967290299 and create a new file in the same sdcard/DCIM/.thumbnails folder using a file explorer, such as File Viewer for Android. Then, name the file .thumbdata4--1967290299. This will stop Gallery from recreating THUMBDATA4--1967290299.
NOTE: A device's .thumbnails folder often includes multiple .THUMBDATA files. Other THUMBDATA files you may encounter include:
How to open a THUMBDATA4--1967290299 file
THUMBDATA files are not meant to be opened.