Linux下使用U盤時，在沒有卸載的情況下擅自拔出U盤後，U盤成爲只讀文件系統，說下修復的辦法。
環境：
OS: Linux 3.9.4-1-ARCH
U盤：FAT32
今天向U盤上拷了文件後，沒有卸載就拔了U盤，再插上電腦，稍等片刻時，發現成爲只讀文件系統。嘗試使用sudo chmod a+w /U，顯示爲只讀文件系統。只好查看打印的系統信息
查看系統打印信息：
$ demsg | less
看到如下內容：
[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)
寫的很明白，被不適當的卸載造成有些數據錯誤，請使用fsck修復。
使用fsck修復：（sdb1是U盤的分區）
$ sudo fsck -fy /dev/sdb1
含義:肯定回答修復損壞的扇區，保險起見可以不加f與y。
修復後，正常卸載U盤，再插上U盤：
$ 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
打開U盤，可以正常讀寫了。
（完）