oh yes, there appear to be a lot of errors.....
Code:
[126288.484051] usb 2-1: new full speed USB device using uhci_hcd and address 32
[126288.636119] hub 2-0:1.0: unable to enumerate USB device on port 1
[126303.352210] usb 2-1: new full speed USB device using uhci_hcd and address 33
[126303.555576] usb 2-1: configuration #1 chosen from 1 choice
[126308.593306] scsi20 : SCSI emulation for USB Mass Storage devices
[126308.600051] usb-storage: device found at 33
[126308.600059] usb-storage: waiting for device to settle before scanning
[126313.603084] usb-storage: device scan complete
[126313.607068] scsi 20:0:0:0: Direct-Access Linux File-Stor Gadget 0312 PQ: 0 ANSI: 2
[126313.612098] scsi 20:0:0:1: Direct-Access Linux File-Stor Gadget 0312 PQ: 0 ANSI: 2
[126344.112069] usb 2-1: reset full speed USB device using uhci_hcd and address 33
[126349.278075] usb 2-1: failed to restore interface 0 altsetting 0 (error=-110)
[126349.278153] sd 20:0:0:0: Device offlined - not ready after error recovery
[126349.278218] sd 20:0:0:0: rejecting I/O to offline device
[126349.278239] sd 20:0:0:0: rejecting I/O to offline device
[126349.278255] sd 20:0:0:0: rejecting I/O to offline device
[126349.278265] sd 20:0:0:0: [sdc] READ CAPACITY failed
[126349.278271] sd 20:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[126349.278284] sd 20:0:0:0: [sdc] Sense not available.
[126349.278298] sd 20:0:0:0: rejecting I/O to offline device
[126349.278310] sd 20:0:0:0: [sdc] Write Protect is off
[126349.278317] sd 20:0:0:0: [sdc] Mode Sense: 00 00 00 00
[126349.278325] sd 20:0:0:0: [sdc] Assuming drive cache: write through
[126349.285455] usb 2-1: USB disconnect, address 33
[126349.287443] sd 20:0:0:0: [sdc] Attached SCSI removable disk
[126349.287595] sd 20:0:0:0: Attached scsi generic sg3 type 0
[126349.287904] sd 20:0:0:1: [sdd] READ CAPACITY failed
[126349.287911] sd 20:0:0:1: [sdd] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[126349.287923] sd 20:0:0:1: [sdd] Sense not available.
[126349.287962] sd 20:0:0:1: [sdd] Write Protect is off
[126349.287969] sd 20:0:0:1: [sdd] Mode Sense: 00 00 00 00
[126349.287977] sd 20:0:0:1: [sdd] Assuming drive cache: write through
[126349.291456] sd 20:0:0:1: [sdd] Attached SCSI removable disk
[126349.291594] sd 20:0:0:1: Attached scsi generic sg4 type 0
[126349.404104] usb 2-1: new full speed USB device using uhci_hcd and address 34
[126349.616266] usb 2-1: configuration #1 chosen from 1 choice
[126349.626404] scsi21 : SCSI emulation for USB Mass Storage devices
[126349.626885] usb-storage: device found at 34
[126349.626892] usb-storage: waiting for device to settle before scanning
[126354.626253] usb-storage: device scan complete
[126354.630252] scsi 21:0:0:0: Direct-Access Linux File-Stor Gadget 0312 PQ: 0 ANSI: 2
[126354.635233] scsi 21:0:0:1: Direct-Access Linux File-Stor Gadget 0312 PQ: 0 ANSI: 2
[126354.699669] sd 21:0:0:0: [sdc] Attached SCSI removable disk
[126354.699873] sd 21:0:0:0: Attached scsi generic sg3 type 0
[126354.715192] sd 21:0:0:1: [sdd] 921600 512-byte hardware sectors: (471 MB/450 MiB)
[126354.720264] sd 21:0:0:1: [sdd] Write Protect is off
[126354.720274] sd 21:0:0:1: [sdd] Mode Sense: 0f 00 00 00
[126354.720282] sd 21:0:0:1: [sdd] Assuming drive cache: write through
[126354.734208] sd 21:0:0:1: [sdd] 921600 512-byte hardware sectors: (471 MB/450 MiB)
[126354.738285] sd 21:0:0:1: [sdd] Write Protect is off
[126354.738292] sd 21:0:0:1: [sdd] Mode Sense: 0f 00 00 00
[126354.738297] sd 21:0:0:1: [sdd] Assuming drive cache: write through
[126354.738309] sdd:
[126354.773339] sd 21:0:0:1: [sdd] Attached SCSI removable disk
[126354.773527] sd 21:0:0:1: Attached scsi generic sg4 type 0
[126360.640193] FAT: Filesystem panic (dev sdd)
[126360.640204] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.640216] File system has been set read-only
[126360.640903] FAT: Filesystem panic (dev sdd)
[126360.640910] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.641549] FAT: Filesystem panic (dev sdd)
[126360.641556] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.642181] FAT: Filesystem panic (dev sdd)
[126360.642188] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.642771] FAT: Filesystem panic (dev sdd)
[126360.642778] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.643362] FAT: Filesystem panic (dev sdd)
[126360.643369] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.643954] FAT: Filesystem panic (dev sdd)
[126360.643961] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.644568] FAT: Filesystem panic (dev sdd)
[126360.644575] fat_get_cluster: invalid cluster chain (i_pos 0)
[126360.645130] FAT: Filesystem panic (dev sdd)
[previous message repeated many times....]