公司開發的產品，目前在U盤檢測這邊出了些問題
有些U盤能識別，有些U盤識別不了，非常奇怪。
還不是很清楚，具體要往哪個方向查
具體列印如下：
<6> usb 2-1: USB disconnect, device number 2
<6> usb 1-1: new high-speed USB device number 3 using ehci-platform
<6> usb-storage 1-1:1.0: USB Mass Storage device detected
<6> scsi host0: usb-storage 1-1:1.0
<5> scsi 0:0:0:0: Direct-Access JetFlash Transcend 16GB 1100 PQ: 0 ANSI: 6
<5> sd 0:0:0:0: 30818304 512-byte logical blocks: (15.7 GB/14.6 GiB)
<5> sd 0:0:0:0: Write Protect is off
<7> sd 0:0:0:0: Mode Sense: 43 00 00 00
<5> sd 0:0:0:0: Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
<6> sda: sda4
<5> sd 0:0:0:0: Attached SCSI removable disk
<4> FAT-fs (sda4): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
<11> init: untracked pid 3272 exited with status 0
<6> usb 1-1: USB disconnect, device number 3
<5> sd 0:0:0:0: Synchronizing SCSI cache
<6> sd 0:0:0:0:
<4> Result: hostbyte=0x01 driverbyte=0x00
<6> usb 1-1: new high-speed USB device number 4 using ehci-platform
<6> usb-storage 1-1:1.0: USB Mass Storage device detected
<6> scsi host1: usb-storage 1-1:1.0
<6> usb 1-1: USB disconnect, device number 4
<6> usb 1-1: new high-speed USB device number 5 using ehci-platform
<6> usb-storage 1-1:1.0: USB Mass Storage device detected
<6> scsi host2: usb-storage 1-1:1.0
<6> usb 1-1: USB disconnect, device number 5
<6> usb 1-1: new high-speed USB device number 6 using ehci-platform
<6> usb-storage 1-1:1.0: USB Mass Storage device detected
<6> scsi host3: usb-storage 1-1:1.0
<6> usb 1-1: USB disconnect, device number 6
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