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

From: Ian Oliver
Subject: Re: [Bug-ddrescue] Best options for rescuing a DVD?
Date: Tue, 21 Jun 2011 15:24:00 +0100

In article <address@hidden>, Harri Järvi wrote:
> You can query the block device size in bytes from the kernel by running 
> the command
> blockdev --getsize64 /dev/cdrom
> Notice that the SCSI specification allows to report 75 of 2k-blocks more 
> than the actual size. Thus, the block device subsystem may also report a 
> bit too high a number. (drivers/scsi/sr.c)

Thanks, I'll give that a go. I know that there are 5 sectors that won't 
read that are just 32KBytes into the disk, so we may be out of luck. Even 
500 retries didn't get these sectors, even though I tried four different 


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