DCIM/.thumbnails 目录下会产生一个 .thumbdata 文件，很大，删了后磁盘可用空间没变化

[lxk11153]

# busybox3 ls -lFhAv /data/media/0/DCIM/.thumbnails
total 64K
-rw-rw-r--    1 media_rw media_rw    3.7G Nov 21 12:06 .thumbdata3--1967290299
# lsof|grep 'deleted'
// 无对应的文件输出

这个文件是干嘛的？空间没变化这点 why ？

这人也说没影响: https://www.worldcadaccess.com/blog/2013/07/how-to-reclaim-1gb-from-your-androids-disk-space.html

has at least removed the thumbdata file but it doesnt have effect on my memory.. previously, my phone was having a free space of approx 900 MB. now even after removing 2 thumbdata files of apporx 450 MB its still shows 1.0 GB free space in my phone.. it should be around 1.8 GB

[jtnwm]

没变化应该是文件还没关闭

[lxk11153]

@jtnwm 重启手机之后也是没变化

[jtnwm]

android.stackexchange.com/questions/66221/android-huge-thumbdata4-file-in-dcim-folder
在现在的手机上，这个文件实际没有占那么多存储空间。

[app13]

"稀疏文件"

[712e1959]

应该是系统的，music 和 picture 目录下也有此目录。