Re: [gentoo-user] Re: Damaged CD medium

[Mick <michaelkintzios@gmail.com>]

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On Saturday 14 Mar 2015 00:24:30 Mick wrote:
> On Friday 13 Mar 2015 22:24:32 Neil Bothwick wrote:
> > On Fri, 13 Mar 2015 17:54:01 +0000 (UTC), Grant Edwards wrote:
> > > IIRC, there are ebuilds for ddrescue, photorec, and testdisk.
> > 
> > There's also app-cdr/dvdisaster.
> 
> Thank you all.  dd and ddrescue don't work, because the block device is not
> recognised.  I had already tried this with not success.
> 
> dvddisaster requires to have created a file with error correction ("ecc")
> data in advance of the hardware failure, then use that to recover the lost
> bits.
> 
> readcd is great - thanks Joerg!  However, this is what I got in my first
> attempt:
> =================================================================
[snip ...]

> =================================================================
> 
> Does this above mean that the first sector is damaged?  How to proceed from
> here?

I tried various options and I invariably end up with a sector 0 error:

Enter selection: 9 (0 - 20)/<cr>:11
Capacity: 250000 Blocks = 500000 kBytes = 488 MBytes = 512 prMB
Sectorsize: 2048 Bytes
Ignore disk size? yes
Copy from SCSI (0,0,0) disk to file
Enter filename [disk.out]: disk5.out           
Enter starting sector for copy: 0 (0 - 9999999)/<cr>:
Enter number of sectors to copy: 10000000 (1 - 10000000)/<cr>:
Enter number of sectors per copy: 64 (1 - 64)/<cr>:
end:  10000000
readcd: Input/output error. read_g1: scsi sendcmd: no error
CDB:  28 00 00 00 00 00 00 00 40 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 00 00 00 12 00 00 00 00 11 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x11 Qual 0x00 (unrecovered read error) Fru 0x0
Sense flags: Blk 0 (not valid) 
cmd finished after 1.964s timeout 40s
readcd: Input/output error. Cannot read source disk
readcd: Retrying from sector 0.
.~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-
~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~
readcd: Input/output error. Error on sector 0 not corrected. Total of 1 
errors.

The resultant disk5.out is 0 bytes.  Even when I try to start from sector 1 or 
2, I end up with 0 byte output file.  Any other settings I could try?

-- 
Regards,
Mick

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