鉴于我目前的PackardBell 的简易 HDD 录像机不再起作用，我有许多已录制的 DVD，其中有一个打开的会话，但在其他设备上看不到。特别是，DVD 似乎处于尚未关闭的打开的会话中。
$ cdrskin dev=/dev/sr1 -minfo
cdrskin 1.4.8 : limited cdrecord compatibility wrapper for libburn
cdrskin: NOTE : greying out all drives besides given dev='/dev/sr1'
cdrskin: scanning for devices ...
cdrskin: ... scanning for devices done
cdrskin: pseudo-atip on drive 0
cdrskin: status 3 BURN_DISC_APPENDABLE "There is an incomplete disc in the drive"
scsidev: '5,0,0'
Device type : Removable CD-ROM
Vendor_info : 'ASUS'
Identifikation : 'SDRW-08D2S-U'
Revision : 'B901'
Drive id : '3734508360 406631507228 '
Driver flags : BURNFREE
Supported modes: TAO SAO
cdrskin: burn_drive_get_write_speed = 11080 (8.0x)
book type: DVD+R (emulated booktype)
Product Id: MBIPG101/R04/48
Producer: Moser Baer India Limited
Mounted media class: DVD
Mounted media type: DVD+R
Disk Is not erasable
disk status: incomplete/appendable
session status: empty
first track: 1
number of sessions: 1
first track in last sess: 1
last track in last sess: 2
Disk Is unrestricted
Disk type: DVD, HD-DVD or BD
Track Sess Type Start Addr End Addr Size
==============================================
1 1 Blank 0 15871 15872
2 1 Apdbl 15888 2295103 2279216
Next writable address: 1587392
Remaining writable size: 707712
Warning: Incomplete session encountered!
这个开放的会话无法通过 wodim 修复：
$ wodim -fix
Device was not specified. Trying to find an appropriate drive...
Detected CD-R drive: /dev/sr1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'ASUS '
Identification : 'SDRW-08D2S-U '
Revision : 'B901'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Speed set to 11080 KB/s
Starting to write CD/DVD at speed 8.0 in real unknown mode for single session.
Last chance to quit, starting real write in 0 seconds. Operation starts.
Errno: 5 (Input/output error), reserve track scsi sendcmd: no error
CDB: 53 00 00 00 00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 24 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.004s timeout 40s
wodim: Cannot open new session
不过，似乎缺少初始 DVD 超级块：
$ sudo mount /dev/sr1 /home/famiglia/point -o session=0
mount: /home/famiglia/point: can't read superblock on /dev/sr1
有没有办法备份第一次写入会话中存储的数据？