U盘文件全部变成只读模式的解决办法

解决方法：
1. 在Linux系统（ubuntu）中运行如下命令
tail -f /var/log/syslog
2. 插入有只读文件系统故障的U盘
3. 观察命令行输出
输出局部如下：

 Jul  8 16:44:50 cslouis-pc kernel: [15595.155904] FAT: Filesystem error (dev sdb4)
 Jul  8 16:44:50 cslouis-pc kernel: [15595.155905]     fat_get_cluster: invalid cluster chain (i_pos 0)

这表明U盘挂载的文件系统是/dev/sdb4，且文件系统有故障（FAT: Filesystem error）
4. 输入umountU盘命令（注意：此时文件系统还在）
umount /media/* （*是你的U盘名，可以在media目录下查看）
5. 修复U盘文件系统故障
sudo dosfsck -v -a /dev/sdb4
输出：

dosfsck 3.0.9 (31 Jan 2010)
dosfsck 3.0.9, 31 Jan 2010, FAT32, LFN
Checking we can access the last sector of the filesystem
Boot sector contents:
System ID "MSDOS5.0"
Media byte 0xf8 (hard disk)
       512 bytes per logical sector
      4096 bytes per cluster
        36 reserved sectors
First FAT starts at byte 18432 (sector 36)
         2 FATs, 32 bit entries
   7801856 bytes per FAT (= 15238 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 15622144 (sector 30512)
   1950354 data clusters (7988649984 bytes)
63 sectors/track, 255 heads
        63 hidden sectors
  15633345 sectors total
FATs differ but appear to be intact. Using first FAT.
/UNIX:8r4:6MP
  Contains a free cluster (7168). Assuming EOF.
Reclaiming unconnected clusters.
Reclaimed 28283 unused clusters (115847168 bytes) in 16 chains.
Checking free cluster summary.
Performing changes.
/dev/sdb4: 3847 files, 488059/1950354 clusters
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