[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Bug-ddrescue] Best options for rescuing a DVD?

From: Ian Oliver
Subject: [Bug-ddrescue] Best options for rescuing a DVD?
Date: Sun, 19 Jun 2011 07:38:29 +0100


I was given three DVDs containing video taken from some old Super 8 
cine. Of course, the original media no longer exists and these are the 
only copies of the DVDs...

Two read fairly quickly, with just a few bad sectors each. A bit of 
splitting and a few retries later, I had the lot.

The third is different. I'm now in day 3 and have rescued 2471MB. I 
don't know how much data is on the disk: ddrescue went for all 4GB+ but 
I suspect that some sectors are missing at the start such that the size 
is unknown. Which driver/layer/device is responsible for determining 
size of tha DVD?

As it slowed to a stop after about 2500MB, I'm now using this command 

ddrescue -r 100 -b 2048 -c 1 -s 2500MB -d /dev/sr0 mem1.iso mem1.log

Is this the best I can do? Any other ideas? (I added the -c 1 and -d 
after the first "fast" pass.)

I'm currently seeing -

Initial status (read from logfile)
rescued:     2461 MB,  errsize:  38072 kB,  errors:    4725
Current status
rescued:     2471 MB,  errsize:  28211 kB,  current rate:        0 B/s
   ipos:     2224 MB,   errors:    4273,    average rate:      216 B/s
   opos:     2224 MB,     time from last successful read:      42 s
Retrying bad sectors... Retry 1

The last run has been going for 12 hours and has got another 10MB to 
scrape off. Look at that average rate - even assuming it doesn't slow 
down, it'll be another two days to get all 2500MB, and I'll then have 
to move on to the rest of the disk.



reply via email to

[Prev in Thread] Current Thread [Next in Thread]