1. User received an error when attempting to delete a file from a USB drive -
https://listnr.corp.google.com/report/85911197696

2. In the logs, we detect that the volume was not properly mounted so set the file system to read-only.
[193122.661217] FAT-fs (sda2): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.[193134.704719] FAT-fs (sda2): error, fat_get_cluster: invalid cluster chain (i_pos 505113)[193134.704727] FAT-fs (sda2): Filesystem has been set read-only

3. If we set the external drive to this state, we should notify the user when they are attempting an action.