Yrurtj

I have an audio CD (burnt a few years ago) that I want to rip (with K3B or other) to flac. K3B was unable to complete and I realized the CD was damaged.

I managed to recover the data with safecopy and the --stage-1-3 arguments. From the output (see below) it seems that the data was properly recovered.

However, I expected to be able to mount the file and take it from there. Unfortunately it doesn't seem to be the case:

$ sudo mount -o loop -t iso9660 diskimage /media/cdrom1/

mount: block device /mnt/data/Bureau/diskimage is write-protected, mounting read-only

mount: wrong fs type, bad option, bad superblock on /dev/loop1,

       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try

       dmesg | tail  or so

dmesg doesn't show much useful output:

$ dmesg | tail

ISOFS: Unable to identify CD-ROM format.

Indeed it seems to be in an unrecognized format:

$ file diskimage 

diskimage: data

Unsurprisingly, renaming the file to .iso, .raw, .img or .bin made no difference.

Some people on the Internet recommend using ccd2iso but it fails as well (Unrecognized sector mode (0) at sector 0!).

How can I proceed to extract the audio from this raw data dump?

Here is the output from safecopy. The stage3.badblocks is empty.

$ safecopy /dev/sr0 diskimage --stage1

Low level device calls enabled mode: 2

Reported hw blocksize: 4096

CDROM audio - low level access: drive reset, raw read

CDROM low level disk size: 784954128

CDROM low level block size: 2352

Reported low level blocksize: 2352

File size: 784954128

Blocksize: 2352

Fault skip blocksize: 78493296

Resolution: 78493296

Min read attempts: 1

Head moves on read error: 0

Badblocks output: stage1.badblocks

Marker string: BaDbLoCk

Starting block: 0

Source: /dev/sr0

Destination: diskimage

......................................... [40961]    

......................................... [82945]    

......................................... [124929]    

......................................... [166913]    

......................................... [208897]    

......................................... [250881]    

................................[284577](+669325104){X [317950]    

}[317950](+78493296)

................[333739](+37135728){X}[367112](+78493296)



Done!

Recovered bad blocks: 0

Unrecoverable bad blocks (bytes): 2 (156986592)

Blocks (bytes) copied: 333739 (784954128)



xavier@marvin:~/Bureau$ safecopy /dev/sr0 diskimage --stage2

Low level device calls enabled mode: 2

Reported hw blocksize: 4096

CDROM audio - low level access: drive reset, raw read

CDROM low level disk size: 784954128

CDROM low level block size: 2352

Reported low level blocksize: 2352

File size: 784954128

Blocksize: 2352

Fault skip blocksize: 301056

Resolution: 2352

Min read attempts: 1

Head moves on read error: 0

Incremental mode file: stage1.badblocks

Incremental mode blocksize: 2352

Badblocks output: stage2.badblocks

Starting block: 0

Source: /dev/sr0

Destination: diskimage

Current destination size: 863447424

........................[309047](+726878544){X [309175]    

<<<<<<<}[309048](+2352)

.....[313338](+10090080){X<<<<<<<}[313339](+2352)

.....  8-( 95%

Done!

Recovered bad blocks: 0

Unrecoverable bad blocks (bytes): 2 (4704)

Blocks (bytes) copied: 317950 (747818400)



$ safecopy /dev/sr0 diskimage --stage3

Low level device calls enabled mode: 2

Reported hw blocksize: 4096

CDROM audio - low level access: drive reset, raw read

CDROM low level disk size: 784954128

CDROM low level block size: 2352

Reported low level blocksize: 2352

File size: 784954128

Blocksize: 2352

Fault skip blocksize: 2352

Resolution: 2352

Min read attempts: 4

Head moves on read error: 1

Incremental mode file: stage2.badblocks

Incremental mode blocksize: 2352

Badblocks output: stage3.badblocks

Starting block: 0

Source: /dev/sr0

Destination: diskimage

Current destination size: 863447424

.  8-( 93%

Done!

Recovered bad blocks: 0

Unrecoverable bad blocks (bytes): 0 (0)

Blocks (bytes) copied: 313339 (736973328)

I had a similar problem I wished to recover a CD that started jumping in my CD player. I searched on line to find an answer but to no avail. But experimenting I found you can import the recovered file into Audacity as raw data. Then you can separate the tracks and re-encode as you wish.