FireTV Low Disk Space – mbcache.db

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My FireTV started popping up with a low disk space warning and wouldn’t allow me to make it though playing a full video. This was particularly annoying because I added a 32GB USB stick and moved my apps to it, so all files should be writing to the USB.

I checked, and 5GB or so was on the USB, so it’s being used, however yes.. I was low on disk space.

Luckily, I’m rooted and can use the busybox linux tools:

 /system/xbin/du -sh /

showed that yep, /data was using 5GB of space.

Tracing that a little further using:

/system/xbin/du sh /data/*

Showed that  /data/data/ was using 3.9G of space! What?

Insider the launcher directory, the offending file was in /databases. I pulled it open inside and found:

root@android:/data/data/ # ls -l
 -rw-rw---- amz_a46 amz_a46 20480 1970-02-27 15:47 cmsapi.db
 -rw-rw---- amz_a46 amz_a46 12824 1970-02-27 15:47 cmsapi.db-journal
 -rw-rw---- amz_a46 amz_a46 3998175232 2017-01-15 16:32 mbcache.db
 -rw------- amz_a46 amz_a46 65536 2017-01-15 16:32 mbcache.db-shm
 -rw------- amz_a46 amz_a46 524288 2017-01-15 16:32 mbcache.db-wal

It appears that the Amazon Launcher cache file is growing out of control. A little research say this has something to do with this version of the firmware, and the file can be safely deleted. It will grow again though, so this is something you’ll just need to do as it happens until you upgrade to a newer firmware.


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