Dec 7 09:26:01 FMC kernel: usb 1-10: USB disconnect, device number 2
Dec 7 09:26:01 FMC kernel: device offline error, dev sda, sector 954980 op 0x1:(WRITE) flags 0x0 phys_seg 1 prio class 0
Dec 7 09:26:01 FMC kernel: Buffer I/O error on dev sda1, logical block 952932, lost async page write
Dec 7 09:26:01 FMC kernel: device offline error, dev sda, sector 3119 op 0x1:(WRITE) flags 0x0 phys_seg 1 prio class 0
Flash drive dropped offline, make sure it's using a USB 2.0 port.