Comment 7 for bug 1843328

I can confirm this problem.
Retried with known good USB cable (can also read the whole kindle partition using dd without problems) and with latest kernel (5.4.7).

Calibre 4.3

Somehow calibre triggers the vfat module to access beyond the end of the device.

This does *not* happen when mounting the kindle under the same circumstances (same kernel, cable, port, etc.) and performing normal filesystem accesses (including copying the *same book files* to the *same* directory on the kindle but without calibre).

I can reproduce this problem with calibre every time (and the kindle's filesystem ends up being corrupted).