Method Used

Manual chunked approach (MTP limitation — auto-fill scripts don’t work on 11th gen+):

1. Plug Kindle via USB (appears as MTP device in Finder)
2. Create /fill_disk/ directory on Kindle root
3. Write 15 filler files in chunked sizes (100 MB, 200 MB, 500 MB, 1 GB)
4. Target: 50-90 MB free

Final state:

/Volumes/Kindle/fill_disk/
├── filler_01.dat  (100 MB)
├── filler_02.dat  (200 MB)
├── filler_03.dat  (200 MB)
├── filler_04.dat  (200 MB)
├── filler_05.dat  (200 MB)
├── filler_06.dat  (500 MB)
├── filler_07.dat  (500 MB)
├── filler_08.dat  (500 MB)
├── filler_09.dat  (500 MB)
├── filler_10.dat  (500 MB)
├── filler_11.dat  (500 MB)
├── filler_12.dat  (500 MB)
├── filler_13.dat  (500 MB)
├── filler_14.dat  (1 GB)
└── filler_15.dat  (150 MB)

Total: 5.9 GB → 77 MB free