Linux下使用U盘时，在没有卸载的情况下擅自拔出U盘后，U盘成为只读文件系统，说下修复的办法。
环境：
OS: Linux 3.9.4-1-ARCH
U盘：FAT32
今天向U盘上拷了文件后，没有卸载就拔了U盘，再插上电脑，稍等片刻时，发现成为只读文件系统。尝试使用sudo chmod a+w /U，显示为只读文件系统。只好查看打印的系统信息
查看系统打印信息：
$ demsg | less
看到如下内容：
[29153.253989] usb 2-1.2.3.3: new full-speed USB device number 40 using ehci-pci [29153.423524] usb 2-1.2.3.3: not running at top speed; connect to a high speed hub [29153.431450] scsi20 : usb-storage 2-1.2.3.3:1.0 [29154.435792] scsi 20:0:0:0: Direct-Access Generic Flash Disk 8.07 PQ: 0 ANSI: 2 [29154.437255] sd 20:0:0:0: [sdb] 8212480 512-byte logical blocks: (4.20 GB/3.91 GiB) [29154.438207] sd 20:0:0:0: [sdb] Write Protect is off [29154.438214] sd 20:0:0:0: [sdb] Mode Sense: 03 00 00 00 [29154.438930] sd 20:0:0:0: [sdb] No Caching mode page present [29154.438934] sd 20:0:0:0: [sdb] Assuming drive cache: write through [29154.442123] sd 20:0:0:0: [sdb] No Caching mode page present [29154.442128] sd 20:0:0:0: [sdb] Assuming drive cache: write through [29154.473636] sdb: sdb1 [29154.476380] sd 20:0:0:0: [sdb] No Caching mode page present [29154.476388] sd 20:0:0:0: [sdb] Assuming drive cache: write through [29154.476404] sd 20:0:0:0: [sdb] Attached SCSI removable disk [29155.527602] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. [29167.626139] FAT-fs (sdb1): error, fat_get_cluster: invalid cluster chain (i_pos 2111071) [29167.626143] FAT-fs (sdb1): Filesystem has been set read-only [29167.626154] FAT-fs (sdb1): error, fat_get_cluster: invalid cluster chain (i_pos 2111071)
写的很明白，被不适当的卸载造成有些数据错误，请使用fsck修复。
使用fsck修复：（sdb1是U盘的分区）
$ sudo fsck -fy /dev/sdb1
含义:肯定回答修复损坏的扇区，保险起见可以不加f与y。
修复后，正常卸载U盘，再插上U盘：
$ dmesg | less
看到：
[29665.364058] usb 2-1.2.3.3: new full-speed USB device number 43 using ehci-pci [29665.543688] usb 2-1.2.3.3: not running at top speed; connect to a high speed hub [29665.551693] scsi23 : usb-storage 2-1.2.3.3:1.0 [29666.555758] scsi 23:0:0:0: Direct-Access Generic Flash Disk 8.07 PQ: 0 ANSI: 2 [29666.557362] sd 23:0:0:0: [sdb] 8212480 512-byte logical blocks: (4.20 GB/3.91 GiB) [29666.557984] sd 23:0:0:0: [sdb] Write Protect is off [29666.557987] sd 23:0:0:0: [sdb] Mode Sense: 03 00 00 00 [29666.558605] sd 23:0:0:0: [sdb] No Caching mode page present [29666.558608] sd 23:0:0:0: [sdb] Assuming drive cache: write through [29666.561606] sd 23:0:0:0: [sdb] No Caching mode page present [29666.561609] sd 23:0:0:0: [sdb] Assuming drive cache: write through [29666.893013] sdb: sdb1 [29666.895352] sd 23:0:0:0: [sdb] No Caching mode page present [29666.895357] sd 23:0:0:0: [sdb] Assuming drive cache: write through [29666.895361] sd 23:0:0:0: [sdb] Attached SCSI removable disk
打开U盘，可以正常读写了。
（完）
