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[ 6488.340286] usb 1-4: new high speed USB device using ehci_hcd and address 2
[ 6488.472835] usb 1-4: New USB device found, idVendor=04e8, idProduct=5024
[ 6488.472846] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 6488.472855] usb 1-4: Product: Digital Audio Player
[ 6488.472862] usb 1-4: Manufacturer: Samsung
[ 6488.480092] usb 1-4: configuration #1 chosen from 1 choice
[ 6488.483516] scsi0 : SCSI emulation for USB Mass Storage devices
[ 6488.487938] usb-storage: device found at 2
[ 6488.487946] usb-storage: waiting for device to settle before scanning
[ 6493.485068] scsi 0:0:0:0: Direct-Access     Samsung  YH-925                PQ: 0 ANSI: 0
[ 6493.489016] sd 0:0:0:0: [sda] 39063024 512-byte hardware sectors: (20.0 GB/18.6 GiB)
[ 6493.489506] sd 0:0:0:0: [sda] Write Protect is off
[ 6493.489516] sd 0:0:0:0: [sda] Mode Sense: 45 00 00 00
[ 6493.489524] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 6493.548781] sd 0:0:0:0: [sda] 39063024 512-byte hardware sectors: (20.0 GB/18.6 GiB)
[ 6493.549956] sd 0:0:0:0: [sda] Write Protect is off
[ 6493.549967] sd 0:0:0:0: [sda] Mode Sense: 45 00 00 00
[ 6493.549975] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 6493.549988]  sda: sda1
[ 6493.612345] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 6493.612671] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 6493.613321] usb-storage: device scan complete
[ 6551.154753] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[ 6774.663374] usb 1-4: USB disconnect, address 2
[ 6899.168497] hub 1-0:1.0: unable to enumerate USB device on port 4