u盘驱动

如果成功加载，会打印如下信息。

    10.868155] scsi 0:0:0:0: Direct-Access     SanDisk  Cruzer           0.1  PQ: 0 ANSI: 2
[   10.870780] sd 0:0:0:0: Attached scsi generic sg0 type 0
[   10.871410] usb-storage: device scan complete
[   10.879609] sd 0:0:0:0: [sda] 8027712 512-byte logical blocks: (4.11 GB/3.82 GiB)
[   10.883859] sd 0:0:0:0: [sda] Write Protect is off
[   10.883859] sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
[   10.883859] sd 0:0:0:0: [sda] Assuming drive cache: write through
[   10.891735] sd 0:0:0:0: [sda] Assuming drive cache: write through
[   10.891735]  sda: sda1
[   10.900739] sd 0:0:0:0: [sda] Assuming drive cache: write through
[   10.900739] sd 0:0:0:0: [sda] Attached SCSI removable disk