直到昨天，驱动器都正常工作。今天尝试从 Thunar 安装时，它显示：
Error mounting /dev/sdd1 at /media/myname/ARCH_201511:
Command-line
`mount -t "iso9660" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500" "/dev/sdd1" "/media/myname/ARCH_201511"'
exited with non-zero exit status 32:
mount: wrong fs type, bad option, bad superblock on /dev/sdd1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
我使用以下方法进行备份：ddrescue -f -n /dev/sdd backup.img rescue.log
$ dmesg
[ 4303.845743] usb 2-1.5: new high-speed USB device number 4 using ehci-pci
[ 4303.961832] usb 2-1.5: New USB device found, idVendor=058f, idProduct=6387
[ 4303.961837] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4303.961839] usb 2-1.5: Product: Mass Storage
[ 4303.961841] usb 2-1.5: Manufacturer: Generic
[ 4303.961843] usb 2-1.5: SerialNumber: 2D9FF525
[ 4303.962201] usb-storage 2-1.5:1.0: USB Mass Storage device detected
[ 4303.962355] scsi host4: usb-storage 2-1.5:1.0
[ 4304.979880] scsi 4:0:0:0: Direct-Access Generic Flash Disk 8.07 PQ: 0 ANSI: 4
[ 4304.980361] sd 4:0:0:0: Attached scsi generic sg4 type 0
[ 4304.981562] sd 4:0:0:0: [sdd] 3915776 512-byte logical blocks: (2.00 GB/1.87 GiB)
[ 4304.982702] sd 4:0:0:0: [sdd] Write Protect is off
[ 4304.982706] sd 4:0:0:0: [sdd] Mode Sense: 23 00 00 00
[ 4304.983834] sd 4:0:0:0: [sdd] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 4304.989441] sdd: sdd1
[ 4304.992906] sd 4:0:0:0: [sdd] Attached SCSI removable disk
[ 4310.608865] ISOFS: Unable to identify CD-ROM format.
[ 4315.815846] ISOFS: Unable to identify CD-ROM format.
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdd 8:48 1 1,9G 0 disk
└─sdd1 8:49 1 1,9G 0 part
$ fdisk -l /dev/sdd
Disk /dev/sdd: 1,9 GiB, 2004877312 bytes, 3915776 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x687bd47c
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 3915775 3913728 1,9G b W95 FAT32
$ mmls 备份.img
DOS Partition Table
Offset Sector: 0
Units are in 512-byte sectors
Slot Start End Length Description
000: Meta 0000000000 0000000000 0000000001 Primary Table (#0)
001: ------- 0000000000 0000002047 0000002048 Unallocated
002: 000:000 0000002048 0003915775 0003913728 Win95 FAT32 (0x0b)
$ mmls / dev / sdd1
Cannot determine partition type
$ dosfsck -w -r -l -a -v /dev/sdd
fsck.fat 3.0.28 (2015-05-16)
Logical sector size (37008 bytes) is not a multiple of the physical sector size.
$ dosfsck -w -r -l -a -v /dev/sdd1
fsck.fat 3.0.28 (2015-05-16)
Logical sector size is zero.
我如何从该驱动器恢复文件？