There are issues with the flash drive, backup and re-create:
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (5 != 4)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): Filesystem has been set read-only
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (6 != 5)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (7 != 6)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (8 != 7)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (9 != 8)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (10 != 9)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (11 != 10)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (12 != 11)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (13 != 12)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (14 != 13)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (15 != 14)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (16 != 15)
Mar 4 16:31:44 Beast kernel: ata11.00: configured for UDMA/133
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (17 != 16)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (18 != 17)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (19 != 18)
Mar 4 16:31:44 Beast kernel: FAT-fs (sda1): error, clusters badly computed (20 != 19)