macOS Commands Used
mkdir -p /Volumes/Kindle/fill_disk
mkfile -n 100m /Volumes/Kindle/fill_disk/filler_01.dat
mkfile -n 200m /Volumes/Kindle/fill_disk/filler_02.dat
# ... incrementally until 50-90 MB free
Reclaiming Space (Post-JB)
rm -rf /Volumes/Kindle/fill_disk
Caveats
- Not bulletproof — Amazon could theoretically push
payloads under the free threshold, or free space through other
means
- MTP adds overhead — file operations are slower than
USB mass storage
- Don’t fill too much — leaving under ~30 MB could
cause system issues with book indexing, metadata writes
- Reference:
https://kindlemodding.org/jailbreaking/prevent-auto-update/
- Filler repo:
https://github.com/bastianmarin/Kindle-Filler-Disk/